A basic rundown on what's going on in Group B (since your character is in that group):

-Lelouch and Tiger had fled to the first floor of the Main School Building after being chased by the girl in red's spirit, and by now, the spirit had given up chasing them.
-Dito and Grant make their way down to the second floor after meeting up at the third floor, both are armed with some sort of makeshift weapon (Dito has a rusted iron pipe and Grant has a broken glass shard), and are currently talking to SMG4, another person trapped in this setting. (Note: If akje is still with us, Dr. McNinja would be included with this part, but I'm not sure due to the inactivity)