Okay, Here's The Thing. (Destiny)

by Morpheus , High Charity, Monday, August 15, 2016, 05:18 (3115 days ago) @ Ragashingo

With Lightning grenades, there's a cone of tracking proximity with those things--any enemy in that range(say, 6 feet vertical and 1-4 feet horizontal) is subject to damage and/or death. You know that, of course. The thing is, I wouldn't really call those boundaries/areas walls. They fall more in line with a grate or a fence, essentially paper thin. I've been super'd, rocketed, even shotgunned through those fence-thingies. If it were one of those actual 'wall' walls, that would've been a major concern. But the B territory on Twilight Gap--may as well be entirely open.

Now, as for the shots. That first one--that is a laser sight right through that door. Diagonally. You were in direct line of fire for that one. The second hit that killed your teammate--he was a little further off than you were, and the screenshot you took shows that. But advance a frame or two--the lightning grenade is sparking bolts nearly everywhere, at least one of them extending out to where the teammate was, signifying that the bolt had indeed hit him as well. It's all about the angle and location. I managed to find a picture of a guy standing almost where that grenade was thrown.

That door gap is pretty darn wide, and certainly more than enough space for a bolt to diagonally fire through.

Now take the Tripmine grenade. Standing next(parallel) to it will barely hurt you. But the laser on that bastard is infinite. It doesn't matter(or care) if you're 10 feet above it, or on freaking Pluto. You cross that tiny line, you die. That's it. Because of the fact that it's modeled after those tripmines at the beginning of the game, the trip laser will go on FOREVER. Which is why the cone of damage on those grenades are extremely narrow, but one-hit kill fatal.

There's no doubt about it: you were just unlucky.