Pyro during the show?

My wife suffers from panic attacks associated with pyro/fireworks and this will be the first big stadium concert she's been to and is very nervous leading up to the show. We will be at the Wednesday NJ show and are up in the nosebleeds. Can someone who has been to a previous show this tour let me know if there are any pyro/fireworks and if so do you remember when they went off? It would really help to prepare her.