Need to stop the damage once you kill a boss in trials!!!!

Please, GGG, need to stop the damage of the scenary or other when you kill a boss in trials. Inmediatly you kill a boss, the game must make you invulnerable. I died twice 5 seconds later when I killed a Boss and a thing I dont see clearly kill me. For example: I killed the giant rotten Crow in trials and when Im seeing the things dropped Something killed me seconds later. That must be changed, please! Its so frustrating!