Here's some of the possible factors that could potentially help explain that are:

The trap could have been a combination of a grenade tripwire trap and a landmine placed behind it. It's designed so that if the victim enters the trap from the tripwire side, it will both release the grenade and (hopefully) cause them to trip right onto the landmine. If they enter the trap from the landmine side, the result is the same. The mine detonates, and the blast damages you, the tripwire trap, and the grenade so that it becomes ruined and immediately detonates. If this was the reason, you're quite lucky to have survived it.

A single landmine was placed, but the blast detonated a grenade somewhere in the tent that was already there as just a bit of regular spawned loot. The location of the grenade and the location of all other object models between it and you that, either intentionally or not, provided just enough protection with the blast handing calculation to survive the explosion.

A claymore or IED manually triggered by a nearby player holding a detonator, and placed an empty tripwire at one of the tent entrances. The empty tripwire is placed in the hopes that their stumbling will keep them inside the optimal kill zone for an extra second or two. That extra second or two can really pay off, though. Especially when the trap involves a doorway/entrance, where a blast from inside limits it's full damage potential to a small area directly in front of the doorway outside, and may cause significantly less or no damage to those just to the left or right of the doorway. It offers some insurance in case you end up detonating it a second later than you should have. Given that there wasn't anyone that came to loot or finish you off, this one is unlikely in this case, but seemed worth mentioning.

There are all sorts of ways that this could have happened, but the first two at least are reasonably plausible potential explanations.

6 points Electrical_Movie_645
It was a mine, they typically break the leg and damage boots/pants only. In some rare cases it’s not given me a broken leg and it’s usually due to weird placement or just a bug.

1 points fashionablefella
What about the blinking health? Mines usually put me at just half. I stepped on a mine previously in this playthrough but I recovered fully much before I stepped on this one.

parent root

4 points avagar

Here's some of the possible factors that could potentially help explain that are:

The trap could have been a combination of a grenade tripwire trap and a landmine placed behind it. It's designed so that if the victim enters the trap from the tripwire side, it will both release the grenade and (hopefully) cause them to trip right onto the landmine. If they enter the trap from the landmine side, the result is the same. The mine detonates, and the blast damages you, the tripwire trap, and the grenade so that it becomes ruined and immediately detonates. If this was the reason, you're quite lucky to have survived it.

A single landmine was placed, but the blast detonated a grenade somewhere in the tent that was already there as just a bit of regular spawned loot. The location of the grenade and the location of all other object models between it and you that, either intentionally or not, provided just enough protection with the blast handing calculation to survive the explosion.

A claymore or IED manually triggered by a nearby player holding a detonator, and placed an empty tripwire at one of the tent entrances. The empty tripwire is placed in the hopes that their stumbling will keep them inside the optimal kill zone for an extra second or two. That extra second or two can really pay off, though. Especially when the trap involves a doorway/entrance, where a blast from inside limits it's full damage potential to a small area directly in front of the doorway outside, and may cause significantly less or no damage to those just to the left or right of the doorway. It offers some insurance in case you end up detonating it a second later than you should have. Given that there wasn't anyone that came to loot or finish you off, this one is unlikely in this case, but seemed worth mentioning.

There are all sorts of ways that this could have happened, but the first two at least are reasonably plausible potential explanations.

parent root

0 points JKilla1288

Were you crouching? I think I've died every time I've hit a mine while crouch walking, but maybe it was an awkward placement.

parent root
3 points RepresentativeAir149

Sounds like the mine may have hit you higher up than normal. (For example bear traps can headshot you for an instakill) hard to say without being there

1 points YaraBoy

Cuz you’re built different

1 points Green_Celebration_52

I stepped on mine landmine. Didn't break my leg, no flashing health or blood just fucked my boots and trousers. And got me uncone