Hi, I’ve already explained a lot about the Debugger in another topic: Set animation to last frame/first frame - #4 by thomas_gysemans
Basically, it allows your events to communicate with you about the state of your program at a specific moment. If, for example, you tried to print a message in the console as an action of your second event (of your screenshot) then you’d see if it gets executed at some point. Maybe, for some reason, the action “Change the animation speed scale of Player: set to 1” is never triggered, but, if you print a message below it, and observe that message being printed in the console, then it would mean that your program is indeed executing the action and that the problem is somewhere else.