[Even though Chara only knows a few words of BSL, and their Frisk only knows Hands, and the other Chara is using ASL, and I don't know what the other Frisk is, lets just assume that whatever multiversal translator property the Castle has makes them mutually intelligible for the sake of avoiding a headache.
Although it is odd to understand different motions suddenly. Lip movements most don't pay attention to.
...it takes a bit of quick mental negotiation before their Frisk is willing to wryly mentally 'fax' over the movements required, but eventually Chara tucks the bloodied knife back into their belt and signs back to the other Chara.]
Watch your back.
[And to Frisk, who is. Suddenly between the both of them. For some reason. Okay. They've already stood down but if they want to be that certain, Chara won't begrudge. They wouldn't trust them either.]
One chance.
[If the other Chara ever attacks them, any concession they've made here is moot. They're not particularly inclined to stick around their murderer now that vengeance has been shelved (if they ever see their face again it'd be too soon), and they force themself to move away from Frisk and casually take a step down the stairs as if they aren't holding onto the banister for a reason. They are, indeed, watching their step.]
Frisk can stop them now if they still want to talk, or find them later if you like.
Although it is odd to understand different motions suddenly. Lip movements most don't pay attention to.
...it takes a bit of quick mental negotiation before their Frisk is willing to wryly mentally 'fax' over the movements required, but eventually Chara tucks the bloodied knife back into their belt and signs back to the other Chara.]
Watch your back.
[And to Frisk, who is. Suddenly between the both of them. For some reason. Okay. They've already stood down but if they want to be that certain, Chara won't begrudge. They wouldn't trust them either.]
One chance.
[If the other Chara ever attacks them, any concession they've made here is moot. They're not particularly inclined to stick around their murderer now that vengeance has been shelved (if they ever see their face again it'd be too soon), and they force themself to move away from Frisk and casually take a step down the stairs as if they aren't holding onto the banister for a reason. They are, indeed, watching their step.]