I was already aware of how it worked from a conceptual pov! 
 
/melody 1 2 3 4 sends the same packet to the client as casting a spell in slot 1 so I dunno, I'm guessing it's handled client side but the packets we send for spells aren't in a correct order or something. 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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