Hi everyone!
After consulting with my redcat dealer, I decided to take the engine apart to see what went wrong. The problem was found in less than a minute.
Carefully removing the engine block from the body of the Monsoon, a (*) rock fell from under the engine, where it was conveniently inserted, defiantly extending a tip under the flywheel, jamming it oh so very tight. After throwing the (*) thing as far as I could, I decided to go fetch it and keep it as a reminder that even though paper beats rock, rock still beats flywheel.
As the Monsoon now runs as good as new (just as before the (*) rock mentionned above), Redcats rule again.
I almost lost faith in Redcat for a moment, but who doesn't get tested for his faith?

I believed in the good comments about the products, and now I could believe that if my engine survived a sudden stop from a rock without breaking a part, people who blow these engines may be abusing them.
For my defense, I must add that when the purring stopped, I checked for piston movement and found none. From the top, the rock couldn't be seen, and I did not push the investigation further since I was so mad.
Thanks everyone, I will now go and hide for a few decades.
Beware, rock were here before Mankind, they're here to get rid of us.
Patrick