I would also leave!
Never loot me if the fight is over, and I can get my stuff back. And if it happens accidentaly you can put it back in there. It's hard to survive without any stuff when you drop back in, and if there is a possibility to get it back, well then I would like to have it... you can still ask for ammo. Otherwise what's the point or respawning if I can't fight and help the team.
You see the death boxes of your mates on the tiny map (radar). So to say I didn't recognized it is kinda lame. I also always look before I loot. It costs you what, a millisec. come on.
And even if you loot your mates, in 99% of the cases, if the next squad comes after you, you are probably dead. Most 1vs3 survivers of the fights are at the start of a match, but not later. Even if you have a red armor, you still can't kill 3 people with let's say blue shields, if all three of them were pushing you.
1vs3 wins, later on, is just luck, or the opponents are dumb and attack you one after another cause they were spread out to far.
If they close together, there is no chance to win that fight. But I guess people always hope...