Glasgow keep the same starting XV that lost 43-29 to Munster at Firhill last week but the scrum-half says the Warriors have to cope better when the pressure is on.
Colin told the Scotsman: "It was just a little bit too easy for Munster. We have to get a bit more mongrel in us to show teams that they aren't going to cross our line. I think it's coming. We are a bit of a new team, which I know is a bit of a cop-out, but you're seeing the intensity rising week on week now.
"I'm delighted to be given a run in the team but you can't be happy if the team is losing.
"And it's the players that are at fault for the mistakes out on the pitch, not coaches, so we have to look to get it sorted. Ravenhill has that old-school sort of atmosphere with the man on the mic getting the chants going to intimidate the opposition, but that creates a good atmosphere.
"You don't want to be playing rugby in libraries and it's more satisfying when you do play well there and turn them over."