My boyfriend’s first time stutter

My boyfriend’s first time stutter My boyfriend 27M and I had a really bad explosive fight today and he started stuttering really hard towards the end… we were both communicating via call only and couldn’t be with eachother but I immediately comforted him cox it made me really really sad to hear him like that… I resolved the fight quickly and tried calming him down but he had a stutter for like 3 hours after that…. This is his first episode and his dad used to have a stutter but he himself has never stuttered this way ever not even in fights or under emotional duress.. Is it normal for a stutter to kick in for a few hours because of emotional trauma/panic ?? Is he prone to having these episodes again?