So I have one question about the game, it does happen later on so spoilers ahead
During the final parts of the hospital mission, after Carlos gives Jill the vaccine for the Virus, Carlos waits in a chair for a while. Then out of nowhere Tyrell (Carlo's partner) comes busting through the emergency room's doors and sits down, with a pretty bad wound on his side and with visible grunting and staggering in Tyrell's movements. When Carlo's asks what happened (presumably to Tyrell), Tyrell turns on the TV to show Carlos of the missile that'll strike Racoon City.
My question is why was Tyrell hurt in this. Now I can't tell if he was hurt before since I can't remember. So was he bitten?