Lt. Andy Kirkson's revolver was not damaged after he was killed via a car bomb set by McGarity. A car bomb would have cooked off or ignited the ammunition in Kirkson's revolver rendering it unusable. There was also no damage to the wooden grips to his revolver or his leather shoulder holster.
The police need Jonathan to keep the bad guys on the phone for two minutes so that they can trace the number. They have the number, given to Jonathan by mistake! At the same time, the bad guys trace the call to Jonathan's office.
Instead of watching the catering van from the outside, the bad guy is sitting in the cab, giving Max an opportunity to knock on the van, and Jennifer a reason to yell for help, resulting in another scene between Jennifer and the bad guy.