Me and a friend have been leveling warlocks for a while now both affliction. 
	As of last night we noticed only one instance of corruption can be on any mob. 
	We tested it and if i cast it first and he does second only his will do damage. 
	My Corruption replaces his and vice versa. Just tested on a mob while we are not grouped, he pulled with corruption I casted it after but before his dot ticked and he didnt get the mob.   
	What gives?