Stomper Glitch

I was on a no-soup server with my friend, I was using the less than trusty achilles kit and he was Stomper. Anyway, I jumped down two blocks and started hitting this guy (this person didn't hit me once) then, my friend says "I'm gonna steal the kill" so he jumps down and proceeds to hit this guy and all of a sudden (I had 10 hearts) I get the screen saying i was dead/ tp'd to lobby. He laughed cause he thought he had stolen the kill but didn't realise that him jumping down two blocks had killed me. I dismissed it after that and we went into another game. This time it was soup and we were the final two after defeating an endermage trap. Our fight went on for a relatively long time by which point he began running away to refill I was chasing after him and in order to remove the blocks that had worked their way into his his inventory he placed them on the ground as he was running and was jumping on them in order to get a boost (I had full hearts again). Last thing I see is his face as he hit the ground after placing the block, he was probably about 2-3 blocks away, at which point I get tp'd back to the lobby saying I had been poked too hard by his air. He didn't hit me and air couldn't ever do 10 hearts.
Please can someone get back to me soon ty <3

 

In the second one we may have been but in the first we were about four minutes in.

 

The second time it was fourty minutes so we can ignore that one but I wasn't shifting at all on the first one and shouldn't have needed to since he only jumped 2 blocks