Alright, I've caught up. 

It seems Myrina and Arcade have run into a rather hairy situation. 

Aristo, is it alright if Arcade uses Myrina's GEAR's optical equipment to acquire quality targeting data? Unless the mission doesn't allow it, Arcade's machine would perform better at medium to long distances, so I'm thinking that Myrina probably advanced far further into the canyon than he did. 

Probably would have been better had Arcade swapped out the Aeon-II for a standard autocannon or rocket launcher. That way, he could fire guided munitions.