Jim's Superpowers

I haven't heard the commentary or seen the deleted scenes, but was there any mention of where Jim's super human abilities came from? He's presented as a scrawny weak protagonist, but he's a killing machine. It's hinted at when he's exploring the gas station and easily dispatches the zombie kid who was silently sneaking up behind him. Jim's 👀spidey sense tingled and whammo⚾. Then, when he's almost 🔫executed by the soldiers, he somehow scales a 10 ft brick wall and barbed wire, signals the alarm, 🔪ambushes the responders, runs on foot🏃 to the compound without setting off alarms or tripping landmines, has expert knowledge of the compound's rooms and windows, takes out more soldiers, and all while not getting eaten by the zombs. Seems a bit much for a bike courier. Maybe his brain injury left him with newly unlocked abilities.

How! 😮

Ok fantasy theory💭...you know who else shows impeccable signs of agility and killing methodically, stealthily, and swiftly? The zombies💀! Turns out, ole Jimbo was infected after his crash, but showed resistance💊 to the disease. The virus became a symbiont, enhancing💪 Jim and allowing him to survive for 28 days in the 🏥hospital without 🍔food while keeping him physically fit to run. His senses 👂👀👃are keen and he's able to predict his enemies moves and be one step ahead. His ability to survive is impressive, beyond what normal Jim could accomplish. It might also explain why the zombs don't target him as much as the other survivors, since they don't target their own, but he's only half their own so they're still triggered by his presence.