Did she have time to practice casting the spell? Alyssa looked around and noticed that both Belle and another Ravenclaw student had successfully cast it. So she decided that she would attempt at doing it.

Concentrating hard, she moved her wand in a tight circular motion followed by a flick at the end, and said,"Impiriano".

Alyssa watched as a blue bubble began to form around her. 'Cool. Now.' Alyssa thought to herself as she poked a finger into the shield in front of her and watched in amazement as her finger went through the shield like as if there wasn't anything in front of her.

'I guess all I need now is for someone to throw something at my shield and see whether it will bounce off.' Alyssa looked around to see who would volunteer to test out her shield for her.