Is it common for roos to grip a hen's comb when they are being mounted? I have never heard of this before and my roo does it all the time...and it's not going well!
For a horrible incident that occurred because of this, go here:
https://www.backyardchickens.com/forum/viewtopic.php?id=614148
For a horrible incident that occurred because of this, go here:
https://www.backyardchickens.com/forum/viewtopic.php?id=614148