Jim's going to be up the rest of the length of rope in a manner of seconds. Whoever said Jim had a broken fight or flight response is vastly incorrect. His flight response works Perfectly Well when inclined to trigger. Jim's going to be urging Stratos to climb higher as soon as he's caught up.

"Stop staring, go! Now!!" Before it yanks the branch down low enough to reach or worse yet, snaps it entirely. "It's down there--!" Because it was definitely in the pack. Jim hadn't gotten around to sneaking it out to save the coordinates here yet in his shock over Stratos' illusions he'd pulled out in Elsweyr. Considering he told himself he was bringing it to keep close to hand in case they were attacked, well....Jim will kick himself over this later.

For now ensuring he's alive later to do it is much more important.