Home side was on top early on, and thought it was the first hit when Geordy Barrett fell crash, but the attempt was ruled out after TMO found a knock-on from the Ringos in the build-up.
A few minutes later, the inevitable delay was delayed as the sharp handling was created to dive into the corner.
Kyle Lowe looked ready to break up the touchline and return for Glasgow until Barrett went back and pursued him to wipe out his kick and eliminate the danger.
The Warriors hope to suffer double blows when they are punished with a deliberate knock-on to prevent Adam Hastings from running for try-ons. Hastings yellow cards, penalties awarded, mountains climbing for warriors.
Homeside increased it, counting numerical advantages by whipping the ball heavily to blow wax on one wing and sending O’Brien up on the other.
At 26-0, the contest ended effectively, with the clock only 30 minutes.
The blue shirt was coming in the waves and Glasgow couldn’t escape. Sam Prendagast slid the clever little kick behind the Warriors’ defense for Keenan to score.
Halftime came as a welcome rest for the troubled warriors, but Rainster held his foot in his throat and ran through the middle to score.
It was too easy, Josh van der Freier took a basketball pass to the top, with alternative Sheehan trying to try the number seven.
The Glasgow night got worse from evil when Matt Fagerson set out with a nasty leg injury.
Rainster was in no mood to show sympathy. A lovely tip from the alternative Ross Byrne landed in Deegan’s appreciation arm and went on his second attempt in the evening, closing out a powerful clinical display.
After losing in the last three consecutive finals, Rainster is eager to win the Champions Cup. In this evidence, they take some stop.
Leo Cullen, head coach of Rainster: “There’s a good desire at the moment. I had a great day at Croke Park last week.
“We’re interested in the next round and Ulster will be at URC next week. The group is hungry and motivated, and that’s what we want to see.”
Glasgow head coach Franco Smith: “It was the first time I’ve been completely bullied in any part of the game.
“As coaches, we continue to tell players that we need to improve, we need more, and there is a difference between the club and the international level.
“You play teams like this. You know you still understand the work you need to do. There are ways to manage your game when you start to lose decisions, pressure, contact areas in the gym or in the field.”
Rainster: Keenan, T. O’Brien, Apple, Barrett, Lowe, Prandelgust, Gibson Park, Healy, Keleher, Farlon, J. McCarthy, Snyman, Deegan, van der Frier, Conan.
Alternatives: McGrath (52) from Apples, Slimani (52) from Gibson Park. Not used: Sheehan, Porter, Manganese, Doris, Byrne, Henshaw.
Glasgow Warriors: Lowe, Dobby, McDowall, Jordan, Stain, Hastings, G-Horne, Macbeth, Matthews, Tarakai, Brown, Samuel, M-Faggerson, Darge, Vairan.
Alternative: G. Horne’s Schickerling (60), Matthews’s Bhatti (48), and Afshar for Samuel (60). Not used: Stewart, Dupres, Williamson, Ferry, Canseriere.
Singbin: Hastings (22).
Judgment: Luke Pierce (RFU).
