As I recall they survived. They just stayed back once Anduin’s wrecked ship was identified, nearer to the offshore expeditionary forces while the team of Rell, Amber, Sully and Mishka pushed farther inland with their search.
Which makes sense; leaving one or two agents with the army would allow for the field team to send coded reports of their progress back to the Admiral knowing there would be someone on hand to decipher them for her and encode her replies.
(Come to think of it, Mishka may have only rejoined the field team to treat Rell’s and Taylor’s injuries once the Alliance airship arrived at Pearlfin Village.)