A PUBG streamer snagged a 3K team wipe with a deagle. While looting on Sanhok, Redditor Tuxedo-cat13 saw his teammate go down and ran to his rescue with the only weapon he had on him: the deagle.
While there could be worse guns, you probably want some type of assault rifle. The deagle can at least give you instant headshots through a level two helmet, and only takes a couple of body shots depending on their body armor.
Our protagonist actually engages another enemy team, separate from the enemy team that fought his friend. Or that's what seemed to happen. His ally is on the far side of the compound and is left alive even after he's knocked. Tuxedo-cat13 takes on one enemy at a time and only takes damage from the first engagement. The second enemy completely missed him and the third didn't even have a chance at firing his weapon before our hero took them out.
So if your friend looks like they're in a tough situation, don't give up. There's still a chance to save them.