Board Thread:Questions and Answers/@comment-25294051-20150524201240/@comment-25209037-20150531051259

Sparks are created when 2 units' hits, not attack as a whole, overlap, that means that spark damage modifier can get changed midway of the attack when a different spark buff is applied.

For example: Len w/Lexida, 50 hit count/attack. He gets buffed by Claire's SBB. That means that when each of Claire and Len's SBB/normal individual hit spark, or overlap, with the other, their spark damage is boosted to x2.05 (125% normal spark damage + 80%). If midway of that attack is Elza used her SBB, then whenever their individual hits spark with each other, then, the spark damage will only be x1.95 (125% normal spark damage + 70%).