The ball that reed said he thought was his until the referee said he had to be certain and so Reed changed his mind
Reed isn't alone in having a history of these shenanigans. Kuchar has a couple, his best being the drive that landed and spun back into its own pitch mark. Mickelson in Myakoba getting relief from a sprinkler that interfered with his swing. He was in shrubbery so deep and dense that the camera couldn't pick him out. He couldn't swing because of the density, but if he could have the sprinkler would have interfered with it.
My favourite is Charl Schwartzel asking for relief from a sprinkler which was at least 2 feet in front of his ball. He claimed that he could possibly catch it during the swing and potentially injure himself. By coincidence, he had a dreadful lie and relief would have allowed him to drop on the fairway.
It was total guff. The watching world, including the referee could see that there was no case for relief. Schwartzel was practically begging the ref to agree with him, which would of course have legitimised the decision, but to his credit the ref stood his ground. He just kept on repeating that if Schartzel was absolutely sure of his case then he should go ahead and take relief.
He played as it lay. He knew that without the protection of the referee's agreement he would come under serious, and deserved, scrutiny after the round.