[Bug] Tryndamere ult interaction with GA

I just played a game as Tryndamere and had an... interesting experience involving GA. I was in a fight and popped my ult before I died (or so I assume since it went on cooldown and I had the buff), but instead of continuing to fight I did the GA revive animation and my GA went on cooldown too. My ult continued to tick during the animation. After I revived from GA I had a second or two to try and escape before my ult ran out.

The way I see it either I didn't use my ult in time and died thus popping my GA and then used my ult while I was in the GA revive animation, or I did use my ult in time and my GA popped anyway. Unfortunately I didn't have LoLReplay running so I can't say which one happened, but it seems like this is unintended behavior either way.