Contain vs FB motion

If the FB is sliding motion to the strongside the SLB in a 4-3 should adjust with the FB enough to maintain force/contain. Like morpheus said, however, the MLB and the backside defenders better be ready for the counter (GT) coming back to them. Our MLB reads the RB then to the "flow" side guard. If he reads an on block from the "flow" side guard he stays on and pursues the pitch inside-out through the C-gap. If he reads pull the MLB redirects to help out on the counter to the backside. Your WLB should already be keying the RB and expecting a misdirection play with an off-set FB away from him.