>>29367720retrobro here, to add some context from my side:
1. Bolts is Bi-Pedal not 4 legged, if he falls over he has a centrifugal core that "throws" him back up and he got small arms he can put out like R2D2 to do stuff
2. Bolts could hear the priestress clearly since the post of the meatpriestress this was a reply to mentioned the message going through the void wich onobots got a link to, so he could pick up the message because he happened to be this close to the priestress when he was in the vent above her by chance. So whatever information the priestress send he got and so if there is a way to work out how the priestress knows about it then so does he after this.
3. about the fact that sanalites where there to get "food" for sana would be something i would assume Cass has spoken to with Bolts at some point of them beign together in the walls of lamington since they are both maschines from a different world and so there is no reason for Cass to assume Bolts would have any issues with this until Bolts told her that Onobots are fond of the life here and instead of them abducting and killing people, even more so with races and people they have a fondness for, he would rather that Sanalites come to the Retro Reich and take part in one of theri BBQs featuring meat from /meat/. (yes i am away of the weird logic but Onobots are not one for details.)
4. as already stated he would be with cass at the time but that would have been a holograph and not some physical body of hers, while cass might be omnipotent and godlike on the station, the onobots actually work on a completly different and foreign system that mixes soul and maschine so she should also not be able to "hack" him to send a jolt through him, at least not easily.
