Tryndamere Ult triggers during GA revive

This has only happened once and I haven't attempted to reproduce yet.

Attempted to trigger Tryndamere's ultimate before dying while having Guardian Angel available. I die and during the time that i'm being revived by Guardian Angel my ultimate is triggered. Due to my ultimate being active during GA revive I died instantly upon reviving.

I've saved a highlight and have uploaded to youtube here: https://youtu.be/WTuYg9u2mLE