Not to drudge up a year old thread, but I just noticed this same issue with another spell called Dawnstrike when I was testing some things on a Druid. It functions the same way as Mana Weave in that it has a chance to increase the damage of the next spell cast, or cause a backfire reducing spell damage, but like Larrat stated, it only applies to the spell that was cast, not the next one. 
 
My server is fully updated (and I update it as necessary) so I know it's not an isolated occurence on Irreverent. 
 
If you've figured out a fix Caryatis, I'd be most humble to get that one off you. 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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