Well, perhaps once, or twice. But he didn't splinch anyone yet, so it was relatively safe.
It helped to have a single person to worry about instead of two. It also helped that he thought of picking the most familiar Apparation point at the Garden Court as he grabbed Snape's shoulder and spoke the incantation.
Pop.
Al opened his eyes.
Whew, he thought. I think we made it in one piece.
Snape and he stood in the narrow dark space surrounded by books which infested the walls and furniture like all the odd types of fungi.
Al felt the floor vibrate faintly with sounds of laughter and dialogue.
"Er," he said. "The party is out the door, to the corridor, and down the stairs."