Riot is lying to us.......

So i have noticed over many games that , well s ult says that Lamb grants all living things inside the zone a respite from death....That isnt really 100% true...So units CAN die from fountain tower as well as being protected by many other ultimates from , , etc....Riot please i know that fountain tower is true dmg....but ignite is also true dmg as well as red buff....so why can we get killed by that tower...hmmmmmmm [zombie-brand-clap] [zombie-nunu-bummed] [zombie-brand-mindblown] [sg-shisa]