Just a small critique of an overall good article from what I read;
"I see you are extremely furious. I won't let you hit. Set aside some opportunity to quiet down in your chill off zone."
I'd advise against using language that's directive if they're upset as it is seen from, in that position, as being talked down to, which obviously makes anybody more agitated and mad.
It'd be better to say "I know you're upset and I'm sorry, but you can't go hitting things okay? Is there anything else I could do to make it better (obviously fix the wording for the situation)?" Followed by something along the lines of "I'm sorry" and you either not being able to fulfill their request or let them do something for a real reason (not because you said so) then redirecting to "when you're ready we can do (X)" signaling to them non-aggressively for them to sort their self out and just come when they're ready.
It may seem subtle and silly but in my experience it makes a huge difference and prevents things from escalating. Nobody likes being treated small, especially when they actually are small :)
I appreciate your input. To sum up things, we just need to show our kids how strong our love to them.