To his later chagrin, the first reaction Billy had do him being so easily disarmed was to unleash a prodigious stream of profanity. Consummately unprofessional and a habit he had been hoping to break, but it was not a conscious reaction. After the few moments of him regaining his conentration, instinct failed him without a wand and he was forced to do whatever he could to avoid whatever fate this man has in store for you. Billy guessed his many personal wards might be able to take whatever first spell the man flung, but after the defenses just stopped his hand from being severed, he didn't want to try it.

Usually he would never resort to wandless magic. A dangerous, risky business at the best of times, usable to a decent degree by only the most skilled wizards. Billy was not one of the most skilled wizards, and the army had never taught him how to do it, not wanting to waste Warlock Sam's time or money. Billy was, however, familiar with the rudiments, and they would have to do fine. Precision would never be achieved, but he didn't need to be precise if he just had enough energy, and he had more than enough spare.

He shouted, partially in panic and partially to throw his assailant off, "Ventus Maximus!", and pushed as many thaums into the spell as he could manage. The effects were as drastic and chaotic as would be expected. An ungodly gust of air blew out of his extended hand, throwing the angry man off his feet and into the hall. Unfortunately for Billy, he had forgotten about one Sir Isaac Newton and those pesky muggle laws of physics. Normally mitigated by magic, this particular casting was not made as such, and Billy found himself flying backwards too, his hand wrenched back painfully as he flew a few feet.

He wished, as he flew, that the army had perfected attaching modified broomsticks to people. It was a great idea in theory, but modifying the ancient broomstick enchantments was a slow business, and not likely to be completed for years to come. It would have saved Billy a headache if they had been finished, that was certain. He was blown back and nearly brained himself on the back wall. He was heavier than the assailant, and more ready for the catastrophic results of the spell, and through either blind luck or divine intervention Billy managed to land approximately on his feet.

His two auror companions, their vestments and hair rustled considerably by the burst of air, acted once again to their credit, both stunning the prone man at the same time. He found his wand, glowing thanks to a handy safety enchantment, and prepared to fend off other attackers, but for the next few seconds at least none were forthcoming. He wanted to use Fiendfyre to blast the barricade around the corner, and all of a sudden wondered why Blackwell didn't do that from the start. Fire that can turn corners and almost never be countered would make short work of the barricade, and every second wasted here was potentially dozens more civilian casualties. Deciding to act first and chide his superiors later, he simply motioned for the other two aurors to stand back from the last wall, and blew it inwards with "Bombarda Maxima", blowing the dust clear with another ventus spell and taking cover, preparing to protect the other two aurors as they leaped through the new, much more jagged, hole in the wall.