That was a good question. How big could it be? Leon held out his arms, trying to make a mental measure of the distance between his hands. "Mm... Possibly an arm's length. Guy's arm, anyway." Expellian measurements would probably mean very little to them. "I don't know if I can do anything bigger than that, but I haven't tried. The one I did last night was fairly long, but the blade was thin. I have a book here, if you want to draw out what you--"

There was an explosion down the hall, and Leon stumbled. He spun and stared wide-eyed at the wall behind him as though he'd be able to see through it to see what had happened. He thought of running out into the hall, but they needed to get this weapon-making business over with. Instead he glanced to Guy, trying to convey the need to check things out.

"What was that?" He grabbed up his book anyway, handing it to Luke. Hopefully this wasn't anything huge.