As your friendly neighborhood person with knowledge about food and cooking, 2 pounds is an absurd weight for an uncooked rotisserie chicken, that is a very small and cooked weight, 4-6 pounds is going to be typical. Also, more importantly, you cannot cook something faster by increasing the temperature past a pretty quick point, meat is an excellent insulator. No slap can cook the inside of a frozen chicken unless the entire chicken disintegrates.

Tbf though, a slap at 3700 mph would absolutely disintegrate the chicken.

This shouldn’t be the GMs job btw, players, roleplaying and backstory are YOUR department, write a reason why your character would end up with the others. Work together.