Legal Blocking Technique? (NFHS)

[SoGARef]

In the first play #34 dives at the legs of #77 who is not within 1 yard of the LOS. #65 is contactd by another player who pushes him over #34 laying on the gound. My call would be an illegal block below the waist by #34.

In the second play #65 is contacted simultaneously by #34 and the center. Both offensive players are on the LOS and #65 is within 1 yard of the LOS. My call would be a legal block in the free blocking zone.

In the third play, #65 is posted up by the center and #34 makes a delayed contact at #65's legs. My call would be a chop block on #34.