Normally, the two of them would have had to move along the walls to stay out of view of the Stand user, in case they were around the corner. That was not necessary with Lelouch present: Painted Black could peer around the corner for them, observe their surroundings and report back on any observations. While it might not be especially suitable for one on one combat, it truly was an astoundingly versatile Stand for support.

-Lulu's Bizarre Rebellion Chapter 41