[Simbio]

Some friends and I have been discussing this rule as it pertains to the NIFL and AFL. The rule in question is whether or not a defensive back can be outside the shoulders of the 3 down defensive lineman if there is no offensive outside the shoulders of the 3 down offensive lineman. The question is can he float outside the "box" without being head up on an eligible receiver or must he be inside the box?

If anyone could help out, it would be appreciated.