The former Falkirk Fury star was the game's joint top scorer and was voted the game’s most valuable player.
Just two days earlier,the Rocks had lost to the Giants by an overwhelming 37 points but the Scottish side bounced back, with a strong opening period on Sunday of 30-21 that proved crucial in the 83-73 win.
Bunyan, in his tenth season with the pro Rocks side, shot an impressive seven from nine from the field, that included four threes, with the Rocks veteran now leading the BBL in three point shooting percentage with a very impressive 61.9 percent behind the arc.
Another former Fury player Fraser Malcolm, also a Rocks starter this season, scored six points, had three rebounds and four assists in an all round solid game for the forward.
The Rocks have now completed their BBL Cup group stages and sit on three wins and one loss with their quarter -final opponents still to be confirmed.
Meanwhile, yet another former Fury star made headlines in British basketball last week when it was announced that forward Ali Fraser had signed for one of the country's leading basketball outfits - the Leicester Riders.
Fraser, who played for Avignon in France this season, saw the French league shut down due to covid and, after talks with the team, it was agreed Fraser could return to the UK where he signed for the Riders.