It was immediately preceded by a stunning Adam Byrne interception score, but Connacht broke out some serious union with a sublime first-half try finished by Danie Poolman.
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The 28-year-old South African was on hand to collect an inch-perfect crossfield kick by Jack Carty against his home province, built on the back of superb work down the right from Tiernan O'Halloran.
It was the perfect response to an otherwise debilitating Byrne score for the visitors just as Connacht were beginning to establish a foothold in the game.
If there was a roof on the Sportsgrounds, it would have ended up in Roscommon.
