The wand in Archie's hand jumped from his grasp and headed toward the floor.  It was unclear whether he had dropped it or accidentally thrown it in terror.  His arms flew over his face, and he nearly fell to the ground to try and avoid the blast.

Once he was sure it was over, he anxiously peeked up at Gervaise.  While he normally would have tried to retrieve the wand and return it, Archer didn't want to cause anything else to explode, so he quickly side stepped it.

"I am so sorry, sir!  I-I-I can clean it all up for you and repair it."  Even though he had no knowledge of how to go about fixing a window.  Seeming as if he were about to have a panic attack, the boy tugged at one of his jacket buttons until it truly popped off from all of his worrying.  He was going to be a failed wizard; he just knew it.