The group navigates around so that they are all waiting in a stairwell just behind the door leading to the guarded lobby. Lawrence finagles the mechanism on the door so that it can be opened from inside the stairwell. With that complete, he transforms into a swarm of spiders and slips underneath the door.
Lawrence's swarm form is usually quite visible. By taking great care, however, he is able to slip along the edges of the door and between the ceiling tiles. The guard, who seems mostly intent upon the elevators, doesn't see him coming. In position, Lawrence drops onto the surprised guard.
Back in the stairwell, Soundtrack had been working hard to muffle his own natural soundtrack so as not to give away their position. He's not sure if he actually hears Lawrence attack the guard or if it's a cue in his soundtrack, but he is certain when the moment arrives to throw the door open. Reflexively, he cancels out the sound near the door across the lobby where the helpless guard is being neatly wrapped up in webbing by a thousand tiny spiders. Silently, the guard in cinched up and dropped in spot.
Once he's sure that the guard can't move or speak, Soundtrack allows sound to return to the room.
(ooc - Thanks for bearing with my traveling this summer. Now, back to the game!)