@artemis one of the best tools I have found for helping kids deal with big emotions is the Incredible 5 point scale. https://www.5pointscale.com/
I brainstorm with them while they are calm how they can climb down the ladder. Counting to 10, blowing up.a pretend balloon, stomping etc. So when explosions happen I just have to say 'Oh it looks like you're angry at a 5, how do we get to a 4, so we can start to fix it?'. It doesn't always work straight away but it certainly helps a lot.