I'm sure he wouldn't be upset at Teramisu. His former band-mates in the Asian Jazz All-Stars Power Quartet have a tuine called Teramisu, dedicated to him.
But if anyone feels 'triggered', I do apologize.
https://www.allaboutjazz.com/on-the-road-with-the-asian-jazz-all-stars-power-quartet-jeremy-monteiro-by-ian-patterson.php?page=1
That was a pun on "lost his shit". Lost his bushito....get it? Again, if anyone feels particularly 'triggered', I do apologize.
So...how about this: at the concert Terumasa had a sudden flashback of his little brother Motohiko pounding on the drum set non-stop, and, in a state of great distress, converted that memory into the altercation with the kid drummer. Any Freudian analysts here, who can put it into proper terms?