You really shouldn't respond if you don't know what the fuck you're talking about. It doesn't matter if the block was below the waist or in the back of the defender.....During a forward pass that crosses the line of scrimmage, it is ILLEGAL to block a defender downfield, until the ball has been touched.
IF the ball is thrown in the immediate area of the contact. Here is an example, straight from the NCAA rule book, of one way how that would be a penalty:
A80, a tight end wide receiver, moves across the formation on a pass pattern at a
depth of 25 yards where he contacts B1, a safety linebacker, before or after the
ball has been thrown. A88, a wide receiver positioned on the opposite
side from the tight end at the snap, crosses behind the contact of A80
and B1 and catches the legal forward pass.
Both plays were in front of the contact, and for that matter, were 10 yards away from the pass. For that matter, on the first play, the LB never even saw the guy coming from his left. When the ball was snapped he started turning towards his right, as he was in pass coverage. Now, if another receiver came and tackled a DB that was obviously tracking a receiver right from the line of scrimmage, then I would agree with you. The second play, the LB even engaged the receiver and pushed him. But two plays on a linebacker who isn't obviously covering anybody in particular? Come on.