Maybe it was the fact that he just hated Slytherin, or maybe it was his love for practical jokes, in all honesty it was probably a combination of both. Either way, he more often than not found himself in the dungeons when he was trying out one of his new toys, and every time it merited an even louder laugh than the last time. How could he possibly not try out his brand spanking new firecrackers complete with a fifty percent louder explosion and a nifty inclusion of a hallucinogenic which would make whoever was struck with it see all kinds of things.
It was safe to say that Brian was completely ready for detention on this one. He had heard about a few older Slytherin's who had bullied a first year into being their lap dog for a week or so. The poor little fellow was too afraid to say anything to anyone because he was scared of the repercussions, well little man, these were the repercussions of messing with a Gryffindor.... fireworks. At least from Brian's point of view their actions merited retaliation.
So he found himself in the dungeons, again, with a sly grin on his face. He was not quite sure why they even allowed him down there anymore, people had to know exactly what he was doing, it wasn't like he was going to do any extra work in the potions lab. Luckily for him, though, no one was around as he made his way down. He had timed it right, most of the younger students would be in their common rooms while the older students would be in the extra rooms studying for their OWLS and NEWTS. Speaking of which, he should probably start studying.
After a few days of stalking he knew where the three boys studied at and he knew exactly where they were going to be at. He sneaked stealthily down the hallways, firecrackers in hand, and a look of determination on his face. When he reached the door, he peaked his head up to make sure they were all there, and sure enough they were. He pulled his wand out and he placed it on the fuse. He was going to have to high tail it out of there if he wanted to get away.
Lighting the fuse, he quickly opened the door, and he tossed the firecracker in the middle of the room. There were more people in there than he expected, but hey, casualties of war. They happened. "Sullivan 100, Slytherin zero!" He shouted as he launched the firecracker. He wasted no time, slammed the door, and tapped it with his wand, hopefully locking them in long enough for the hallucinogens to take effect.
A loud bang was followed by shrieks of surprise and a few guys yelling out and cursing at Brian. A laugh escaped his mouth, but he could not stand around and watch forever, he had to get out of there. Taking off in a sprint he ran down the hallway but his escape was cut short by a door being flung open. He tried to dodge it, but it was no use, he crashed right into it and then right on top of another student.
He braced his and her fall both, not wanting to cause physical harm to himself or another person. He landed directly on top of her and he looked down, dang, she was pretty cute. A smile crossed his face "I know you're excited to see me, but we can't do this in the hallway darling."