Esta is paying some occasional attention to Merrin, as well as to his surroundings and above all to staying upright. Thankfully Locate Object does not require concentration.
And now he's confused, because Merrin seems visibly to be swimming worse, as if injured; and that level of impact should not have done that much damage to Mariona, let alone to Mariona in armor.
But his {comms link} is conveying a sound, probably from Merrin's armor, that sounds like Dark Tapestry artifacts sound when they are unhappy.
He'll wait until Merrin is not visibly engaged in any complex maneuvers, and then yell over the comms link, "All good?"