Yet 40 minutes later Kellock had four tries, 28 points and a priceless bonus point to discuss in the post-match interviews after a magnificent second half fightback.
"When you're down that many points you have to have a reaction. It was difficult to pick one area we needed to improve then, because we were making mistakes across the board," admitted Kellock.
"Yet after the final whistle I was relishing the prospect of playing Toulon again, this time on our home ground. Now we need to make sure we don't go back to where we were."
Meanwhile, the Warriors Pool 2 rivals Exeter Chiefs will be hoping they can go back to where they started last weekend when they ran Cardiff Blues off the field in an opening half at Sandy Park that saw them lead 36-6 having scored five tries.
They lost the second half 23-8, and let the Blues pick up an unlikely bonus point, and were reduced to 13 men at one stage with two players in the sin-bin. Head coach Rob Baxter will want to re-run of the first-half on his side's first visit to Scotstoun and knows that a second successive win would keep the Chiefs on course for an epic battle in December with Toulon in the back-to-back games.
The two teams met in a pre-season friendly in Exeter and the Warriors proved streetwise enough to come away with victory. They haven't been beaten at home since Leinster triumphed 6-0 in December last year and another win would put them right back in the mix in the Pool.