American football defenses that use the 2-gap system often have the problem that a tackle passes through both gaps and interferes with himself...
Mike Singletary used to take advantage of this strategy from his linebacker position. Rather than interfer with himself in the backfield he would hold both positions behind the offensive line giving him the option of taking out the runner or slamming the quarterback as the play developed. On some occasions he has done both simultaneously. QM being what it is, however, in viewing the films you only observe the resolved Singletary in a single state, but everyone familiar with the man knows what really happened.
Edited by AZPaul3, : No reason given.
™ Version 4.2