I’m not YogSosoth but I’m pretty sure he (she?) is adding a loud WHOOOOOOSH to the scratching and ghost noises
I do like the idea of having a time-out timer - your son will learn fairly quickly that when the timer is counting down, he can tell his time will be over soon. Aside from that, lots of good strategies suggested here.
We had pretty hellish toddlers. As it turned out, Dweezil was autistic which didn’t help things. He was very verbal - until something set him off then it was nonverbal, screaming, totally unreachable. When I was pregnant with my daughter, and supposed to be on bedrest due to my body’s attempt to self-destruct, there was the time where I was home alone with him (while my husband was stuck on the other side of a bridge), and he just kept following me around and screaming incoherently at me. This was the worst possible scenario (and I do believe it contributed to my health worsening and emergency delivery a week later). The only thing that stopped him was my screaming right back and bursting into tears - I think that scared the hell out of him because Mommy Doesn’t Do That. (of note it was as well that I couldn’t move well because at that point, the only thing I could think of was doing him physical violence. I might well have resorted to hitting him :().
So… there’s a vote for lying down and screaming as a way to startle them out of the tantrum.