It looks to me like he is first going to mark a spot inside the 1. Then something tells him to look for the lineup so he puts hand up and starts moving. Obviously the R is not paying any attention to him (not unuusal for most R's since they only care about themeselves anyway), so the S just guesses at a spot. But something else then happens which we do not see in the clip and the thing ends up being a touchback. Would sure love to know how that crew conversation went.