He will recover. Maybe a gentle walk if the weather is nice tomorrow, somewhere quite? Somewhere to gather your thoughts. Journalling can be useful too.
I have always checked emergency exits, have involved the Fire Service many times. I almost got thrown out of a Theatre because I went round trying the exits which were all locked, I was assured that the Security Staff would un-lock them if necessary - you will unlock them now or I will ring the Fire Service - this was a long corridor with no Security Staff in sight so it was suggested to said theatre that they must have someone sitting by each fire exit at all times when the public were present.
So sad today. One girl missing, I wonder if a 'taxi' driver took an opportunity
or whether she in fact use the Concert as an excuse to be elsewhere ......... or worse.