Fred and George had been researching Muggle weaponry in general and they were up next, suggesting flashbang grenades that stunned and disoriented, pepper spray, tear gas grenades, and gas masks as an alternative to bubble-head charms. They believed that the tear gas and pepper spray would make good back-ups in the event that the Kolokol-1 didn't work on goblins the way it did on humans, in order to disable multiple beings at once. They suggested the flashbang grenades would provide a useful advantage if their opponents cast bubble-head charms in time to avoid inhaling the gas. They also, hesitantly, suggested acquiring general frag grenades, "just in case'.