I think that if he looks at it for 90 seconds and can't determine what the answer is, then his call has to stand. The question is whether he should need to look at that for 90 seconds or if that's simply a product of him really wanting to stick to his call. Audio could be interesting on this one--feel like it would probably just be an audible BigSoccer debate. For me, I think it's not an expected penalty in England. But at the same time, the bar for overtuning a referee's call is also high, so maybe that's just the argument here? "Wrong but not clearly wrong."