Ho stack is different from vert because it's much more fluid and presents the throwers with more options. Every player on the field is a viable cut and throw in this offense.
The pull happens, and both teams set up. Note the spacing of the upfield players and that unlike the vert, there are 3 handlers, players 1 2 and 3.
The defense is forcing to the right sideline. This means that throws in that direction will be the easiest to complete. Player 5 is going to receive the disc, and fakes out to move his defender. All other player must move as well.
Player 5 makes an in cut at a 45 degree angle to get the disc. Notice how every other player moves to create space. Player 6 takes his defender out of the way to create a cutting lane for player 5.
Player 5 now considers his options. Here, player 7 has open space up the line, so player 5 makes the continuation throw gaining more yards. Notice that if player 6 doesn't move his defender, this throw is not possible. Player 6 is the most important player right now. He has now made 2 great plays without touching the disc; creating space is what allows this offense to work
Player 4 is streaking across the field, but let's assume that his defender is too close for player 7 to make a good throw. Player 7 decides to dump the disc and reset the offense.
Player 3 tries to get open, but is unsuccessful. Instead of wasting time, he moves and allows player 2 to come across for the dump.
And player 2 gets it. During this handler motion, the other players recognize that the offense is being reset and fall into a horizontal stack once again. Notice that the initial positions are all different; this is fine, but the players have to communicate with each other to get it set correctly.
Vert stack opens the left and right sides of the field whereas ho stack opens up the front and the back. This next sequence is a very effective and common attack. Player 4 moves to come in, whereas player 7 fakes in to go out.
Players 4 and 7 need to leave enough space so that they don't pick their defenders and disrupt the play. Player 4 attacks the front side and gets the disc.
As player 2 streaks up the sideline, player 4 dumps it back, allowing player 2 to catch in stride and put his momentum behind the disc for a powerful throw.
Player 7 now cuts hard behind the stack. This open space is completely undefended, and he receives a nice huck from player 2 for the point.