Tryndamere Ult Bug

So I decided to get meself into a ranked match, and in the middle of the match I was split pushing top were a Taric and Ryze came to stop me. After getting me to low Hp I popped my ult, and about me being 2 sec in it I died by a Ryze Q. Btw the ult lasts for 5 sec and nothing can kill a Trynda during his ult.

Rito plz fix