Norm,
It's understood that if somebody wongs in or grabs extra hands in a positive count, he'll be soaking up some of the other players' temporary advantage. But not realizing the "context" of your post, Waveliner might take your answer and run with it, saying, "See, I knew if the rum-dum at third base stands on 15 against an 8, he'll screw up my cards."
We need to impress upon him that it won't "screw up" his cards.