How can you not see it was Campbell that hit the puck?
I don't know why I'm doing this but here goes:
It's hard to see the puck here but it is on the end of Campbell's stick. This is the best screenshot I could get that shows the puck on Campbell's stick
This is Campbell following through with the puck, take a good note where Gelinas stick is -- nowhere near the puck
Again, look at Gelinas' stick, nowhere near the puck and the puck is already in the air and into the corner.
Lastly, this is a bit later on and it shows the puck clearly in the air and behind Gelinas' stick before Gelinas swats at the puck which makes it seemed like he hit it.