[GAMEPLAY] Tryndamere dies through Undying Rage

[GAMEPLAY]

Match: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2050772916/34504467

Tryndamere died through his ult from Ekko, Rumble, or both, or more champions on blue side's backside of red buff

Unsure how to reproduce

Only occurred once.