You know, this one is close enough that I'm willing to cut the refs some slack.
Perhaps he didn't MEAN to cut cooper's man, but his block on 25 was so disastrously executed that he ended up cutting cooper's man in a very real way.
I'm willing to concede the penalty just to discourage such awful blocks. (this is a joke, btw).
To me, this is in the realm of leg whipping. If you get spun around and your leg just happens to whip around and take out somebody's legs, Im okay with you getting penalized. You may not have MEANT to leg whip a guy, but you did.
This is different, to me, then the "defense grabs the lineman on the way past" issue, because in that instance, the defensive player gets "chopped" because of his own actions. He brings it on himself.
In this instance, the defender did nothing wrong, and still ended up getting chopped.
I'm fine with the call, here.