Fiddlesticks' Drain

So...ever since was released, I have always found a weird thing when going against an enemy . What happens is when I use Repel (the go up in the air thing), when is draining me, it doesn't break the effect or anything...letting him do full drain damage, healthgain for the entirety of my Repel.

Has anyone else had issues like this? Is it meant to be this way? Granted, I understand for balances sake that I can repel out of a ult, ult, etc... I'm just not sure since it is a targetable ability that the rules and developers wanted it to be that way.