Brand Passive vs Tryndemere Undying Rage

I was playing a Aram game today as Tryndemere, I would click r and die as soon as brand hit me with an ability. The spell cooldown appeared, but I died as soon as the brand burn touched me. I don't know if this is intended, but I feel that Tryndemere shouldn't die since, "Tryndamere's so strong that he is unable to die, no matter how wounded me becomes."

http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2111574131/32723513 This was the game I played, sorry for not taking screenshots, as it might had proven my word. I died every time to Brand.

This should be reviewed. Maybe changed Tryndemere description to, Tryndamere's so strong that he is unable to die, no matter how wounded me becomes unless Brand's hand is involved.