>>86330A zone of "stopped time" would probably have an tremendous cooling effect to the environment outside of it since there is no or extremely low vibration of atoms. Atoms outside the timestop-zone would bounce against those, reducing their own vibration.
Getting close to the border of that zone would already freeze-burn you horribly I think.
Trying to throw something at it would be like hitting the most solid wall ever as
>>86331 said.