If this is in response to my post
sitting with the dysregulated child in this instance sounds like the only option as otherwise he will keep leaving / trash the room
Talking about it is never done in the moment but when calm and in a time of connection; and never only once. repeated, calm, age appropriate questions (with the help of CAHMS and ELSA) helped my child to understand their triggers and start slowly to react better.
sensory regulation again takes time and yes it’s child dependent but if they find something they like when calm, it can be a reminder and trigger for calming down.
Ive been working on this since my child was 5 when she behaved like the OPs child, she is now 11 and never violent, much better at regulation and understanding her feelings before they take over.
it took a lot of effort and repetition of the things I’ve suggested to OP. Just as sitting in the room didn’t help your child, it was the only option for mine who would otherwise have been attacking her sibling, jealous that I was sat with him.