Brush, since the creature is not moving, and since he cannot determine if Whispers needs help yet, decides to push off. He knocks on the hull, using morse code, an old code form he used with his squad in the Last War (at least B-9 should understand it).
-... . .. ..- ... .... / .... . . .. . ..--.. / -.. .. ... . -- -... .- . .. -.- .. -. --. / .-. . . . .. / . . - .... . . .. / .. . . .. .- .-. - / -. . . .-- ..--.. / ... - .- -. -.. / -... .. .. ..--..[ +- ] Message of Morse Code
Brush here. Disembarking for other craft now. Stand by.
After the message, he will kick off the hull, then lunge towards the other craft, using his soul to help him course-correct as needed. Once he reaches the hull, he hopes to use his echo-jumping to get to the opening, and to find Whispers.