So I've seen the Pats run their goal line 4 tight end set two weeks in a row now. They shift from a traditional heavy front I formation with someone at fullback, to a single back spread offense I believe with 4 tight ends spread wide. When they do the shift, they shift two tight ends at a time to the LOS. I was looking up offensive shift rules and I thought they were saying that only one player is allowed to move on the offense at a time. When with this particular shift, there are two players moving at once. Does anyone know the rules regarding this type of offensive shift?