Sorry, but "shower of blood" is all it takes to push a game into an M-rating by the ESRB's books. I mean, look at Bionic Commando: Rearmed. The game is very clean, for the most part - nobody bleeds, enemies just kind of keel over and slump off the level when shot, etc etc. Until you get to...
[spoiler:593b0c941f]...Master-D/Hitler, and then shoot a rocket launcher. At his face. With a very gory animation, if the NES game is anything to go by - Bionic Commando is one of the few NES games to get around Nintendo of America's asinine content changes, and retain a very gory animation of Hitler's head exploding, so.[/spoiler:593b0c941f]That small part of the game, all the way at the very end, is enough to push the game into M-rated territory. So no, a shower of blood is NOT T-rated by any means at all.