3 Kills in a quick minute during a Solo match in Players Unknown BattleGrounds.
Check this video of it. There are 2 Kar98 kills and 1 Beryl kill that a dude got turned on.
 

The first kill is a Kar98 headshot while the dude named BossageSausage with a level 1 helmet is on the run. 
The second kill is a guy named DEERHUNTER1401 that walks up on me with a Mutant and tries to kill me close range.  I do a little dance and put him down with my Beryl Assualt Rifle loaded with 7.62 Ammo.
The third kill comes instantly after the second.  I see 2 guys duking it out and the victor goes to loot his kill.  I see that he has a level 3 helmet but I pull the trigger anyways, killing Strudelizer 420 while he was probably in a weakened state.