Andy gets to play part one of the F3 HOH because he is current F4 HOH which guaranteed him a spot.
The F4 Veto win just underscores and cements his control of who stays and who goes ... but he has no vote and has to trust someone to do what he wants ... which we THINK is to boot McCrae.
Then the 3 left return to equal status and Play for HOH. The winner/Final HOH gets to choose who sits next to him/her at the end.
I always get so "befuddled" at this point in the season.