Roberts may have scored the try, but Matt Gillett's act of desperation ultimately gifted the speedster with his third try of the night.
Gillett rushed out of the line to charge down a Kane Elgey kick in the 78th minute, recovering the ball and giving off to the quickest man on the park.
It was a heartbreaking way to finish for the Titans who looked for all money like they were going to record their first victory at Lang Park since 2007.
But it wasn't to be, and Neil Henry's men now find themselves at the foot of the table with just one win.