Clean up OP_ManaChange

common/patches/sof.cpp

@@ -936,7 +936,8 @@ namespace SoF
 		OUT(new_mana);
 		OUT(stamina);
 		OUT(spell_id);
-		eq->unknown16 = -1; // Self Interrupt/Success = -1, Fizzle = 1, Other Interrupt = 2?
+		OUT(keepcasting);
+		eq->slot = -1; // this is spell gem slot. It's -1 in normal operation
 
 		FINISH_ENCODE();
 	}