Infected is not like the typical "one man army" zombie survivor game. Where as the single player can be played and enjoyed alone, it is best suited to be played with friends. I felt that the ONLY zombie games were multiplayer (L4D and a few other zombie mods) and couldn't be enjoyed for BOTH their single and multiplayer content. I hate calling Infected a zombie game as the enemies aren't undead but it will probably be called that anyways.
Just giving more sight onto the bow mechanism in his arm