Su Xunxian will be a little useless because he knows better than to put himself in danger just yet. The assault being what it is, he'll still need to use his sword as much as he can until any relative safety, and he'll probably get hurt at some point, but not enough to put his life in danger.
He'll be able to understand the rats, so he'll help with early warning, as much as it will be... early, but it might help a bit.
After that, he'll help with mundane stuff, like barricades, probably boiling water to clean up wounds, etc.
Lat Sizhui will probably try to help out Vanya's concert - 24 hours is a long time, and he can help out with spiritual energy to boost her up. He will then help Lan Wangji's charge against Unhalad - so far, it's them two, Lee Chang, Arche, and Slick? etc. and be a good understudy tank until his fingers bleed and his guqin breaks. Probably helping bring back exhausted people after the meetup with Wei Wuxian and Jiang Cheng or what's left of him happens.
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He'll be able to understand the rats, so he'll help with early warning, as much as it will be... early, but it might help a bit.
After that, he'll help with mundane stuff, like barricades, probably boiling water to clean up wounds, etc.
Lat Sizhui will probably try to help out Vanya's concert - 24 hours is a long time, and he can help out with spiritual energy to boost her up. He will then help Lan Wangji's charge against Unhalad - so far, it's them two, Lee Chang, Arche, and Slick? etc. and be a good understudy tank until his fingers bleed and his guqin breaks. Probably helping bring back exhausted people after the meetup with Wei Wuxian and Jiang Cheng
or what's left of himhappens.Ifff they can help anywhere else, let me know.