Well .. someone should clarify with Darren but I don't think it was accident. If he didn't bump 6 or 8 (to give himself easier shot on 6 from 5), position on the 6 from 5 would have been difficult, especially under the pressure. He did take a bit of time before hitting that shot, planning out the pattern. He may have been trying to bump the 6 so it would've had clear lane to the corner pocket blocked by 8. These guys have amazing talent to execute the patterns more precisely than "amateurs".
If my recollection is intact, he could of hit either side of the 6 and been just as well off, a Very High % shot well executed for the win.