They were going to play a continuous loop of 7, 8, 18 because all holes were close to the 18th where the fans were. Also, it was a loop that contained a par 3, par 4, and a par 5.
Given that the USGA insists on an 18 hole playoff to end a a 72 hole tournament, it seems to me if they were still tied we should have had another 18 holes (then most people could have watched that after work). Anything else makes their logic for an 18 hole playoff in the first place plain stupid.