In given mini case, several torts can be identified:

Assault and Battery:

According to Nick, Sam's worker hurt him so that could be consider as assault. If worker held Nick and made his forehead hit his face which causing bleeding and injuries that could considered as battery.

Negligence:

Nick might be careless for starting a fire in store. Negligence is not being careful enough and Nick's actions might be seen as careless. Sam, the store owner, could also be in trouble if they did not do enough to stop accidents like fires or did not have good fire safety.

Strict Liability:

Nick could be in trouble for starting the fire even if he did not mean to$.$ On the other hand, if the store did not have good safety measures due to this Sam might also be responsible.

Intentional Torts:

If the Sam$$s employee purposely held Nick and he was wrongly kept somewhere, it might be assault and false imprisonment.

Based on these considerations:

Nick could be responsible for the fire because of negligence and strict liability. Sam's worker might be in trouble for assault and battery if Nick's story is true. Sam could be responsible for negligence and strict liability if the store was not safe enough.