The Ravenhill showdown had been billed by coach Hugh Campbell as his team's most important match of the season.
But after going in at half-time with the scores tied at 3-3 Glasgow crumpled and leaked 27 points without reply. Hooker Scott said in today's Sunday Mail: "We have no idea what went wrong. The effort in the first half had been fantastic and we were in with a real shout.
"Ulster certainly upped their game and we started to make mistakes that proved crucial. Once we were behind we were playing catch-up but we never looked like actually catching them up."