Apex legends hack already?

Got into a single shootout close range with a single player and lost, well I must git gud, then while exiting i saw around 450dmg done while the max HP is 200. What the hell?
Also, 2-3 shots from machineguns sometimes as far as 200-250m and more grounds you (head aimbot?) while other times you belch an entire magazine of heavy ammo into an enemy and they still not die. No it's not lag.

Bonus: some people disconnects when you kill them, and you don't get the kill, not sure if a server issue not recognizing disconnections or a malicous intent from the player who deliberately void your kill rate doing this.