Well, when it happened, it certainly looked like a penalty. But the ref was right there, and watching it in slo mo, I don't see a hold, a hook, or a trip. I think it was a good non call, but I agree, if you're Columbus you've seen less than that called. I bet if it's in the first perios, the arm may have gone up. But in the end, it looked clean to me.
And to be consistent, the Bruins were gifted a similar call towards the end of the 1st OT today, when the dude "took down" Coyle.