Halo 2 LASO help on Gravemind

Hello everyone, I have a checkpoint on Gravemind, the first room, when the brute captain arrives, is someone intersted in helping me? I normally use the Halo Completionist and GB Austin guide but this time I literally can’t beat the room alone, too many brutes, grunts and, most of all, checkpoints too distant from each other; I managed to kill the first pack of brutes but I always die when those with carabine arrive.
Is someone intersted in helping me finish the level or at least get through the first room?
I would reaaaaally appreciate it, thanks in advance.

I don’t know how, I made it!! The very first room took seven hours, what a level…