system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] What is the tactical value of Hawks Head Attacking Formation?

It seems like it leaves the ball-carrying chaser exposed and without an outlet pass should they get pressured by the defense.
gpt
Primarily intimidation. All three chasers flying directly towards you, your first instinct is to get out of the way. Of course, this is less effective against higher skilled players, but there are other benefits. The lead Chaser can quickly hand off the Quaffle to either of the "wings," creating scoring opportunities. The Chasers can also break formation and split up. In a sport that operates in three dimensions,   getting the opposing team's Chasers to go the wrong way can be a massive advantage. 

Basically, Three Chasers, three hoops, one keeper. If the Keeper can't keep their eye on the ball, it's an easy goal.