When hit with a critical melee, ranged, or spell attack, if not reduced to 0 hit points, your adrenaline kicks in to:

1. Remove a physical condition imposed by the critical hit. These are motor-physical conditions; if you are knocked prone, you can bounce back to your feet. If you are grappled, you automatically shake it off. This will not remove conditions such as blinded, poisoned, ect. DM's discretion if the adrenaline overcomes thinks like paralysis.

or

2. As a reaction, grant a full action, allowing an attack to include casting a spell.