[NPC Behavior] Odd behavior/pathing issue with Caleb in Nerva

[GM Sijin]

From Solvernia via ticket:

 

I took the following steps to summon Caleb in Nerva Archipelago: Killed 100 Nerva daemons during the day, went to do other things before I saw his message. Went to Thorn Isle, he wasn't there. Teammate found him flying over the ocean. I hit him with Web Envelope and he suddenly shot off at lightspeed, out of sight. Apparently, teammate found him again and attacked him and he vanished again. We came back a few minutes later to find him sitting around on the beach in Primeva. GM Sijin was present when we killed him; he didn't 'shoot off' when he was on the ground and just stayed there.