As you move your hand in a repeating incantation an invisible aura of magic appears in a 5 ft cube around you. Any projectile (that doesn't state that it isn't affected by magic) including magic projectiles that don't exceed 15 plus 2d10 damage are caught in mid air and hover. Anything caught this way can be sent back as an action. If the projectile deals damage above the specified amount than the attack proceeds as normal. Multiple projectiles can be caught this way as long as they don't collectively exceed the damage; all can be fired together or separate as 1 action (at one target). If the projectiles collectively exceed the damage then  ALL proceed as normal. Melee attacks aren't affected.