history: When I worked at a bank, a man came in to rob us.  He had on a mask and had a gun.  We thankfully had a security guard in the back who detained him When I worked at a bank_comma_ a man came in with a gun to rob us That is so scary! Did they catch him?
current: Thankfully our security guard had been in the back and was able to catch him before anything too bad happened
next: I'm pleased to hear that, the security guard sounds brave. Still, it must have been very stressful!