in my decades of playing i have never witnessed what happened in a 10 ball ball tournament last night. player "A" plays a safety, leaving the OB on the right rail by the lower right corner and the 2 ball on the opposite side with many balls blocking. the only shot is to bank up & off the head rail, a long bank. the guy puts the chalk on the table using it as a "bead" on a rifle barrel lining up the line to follow from the OB to the head rail to bank. he, of course, removed the chalk before shooting, but, i think that is not allowed but is there a rule for that? that is akin to placing your cue on the table to line up a shot. foul, game over or ball in hand, what?