After both users have concluded their positioning phase, the attacker gets to make one additional action (any of the actions described in the positioning phase).
The attacker may also play, energy permitting, FAST cards.
The defender may now play, energy permitting, any number of FAST cards. If an action exhausts or stuns the card with possession of the ball, that is called a ‘loose ball’.
If defending an attack on goal you may also play a Goalkeeper card - this is the only situation in which a goalkeeper may be played.