difference between cut block and chop block

[Dommer1]

Quote: "Also in the NFL it can be a chop block if only one block occurs"

The same thing applies in the NCAA book, sort of. If you are "in the act of disengaging, or have just disengaged, but is still 'confronting' the opponent" (I think that's pretty much the wording), then a block at the thigh or below would be a chop block, even without the blocked player being in contact with the first blocker.