How old is he now? (Sorry, with so many folks & chams, it's hard for me to keep them all straight all the time.) Grumpypants used to run away & hide. He had this maneuver when he was small... If he was perched on a dowel, he'd slide himself 1/4 of the way around to put the dowel between him and me—so I couldn't see him. After I'd leave, he's slide back up to the top of the dowel.
He's too big for that now, so he just glowers at me and gapes. Today I gave it back to him, "Oh, big scary lizard! You think I'm scared of you?" and darned if he didn't shut his mouth and look a little sheepish. Sometimes he turns the gape into a yawn, like "I meant to do that." Silly lizard.
Have you tried offering Eustis a treat (superworm or something) from the flat of your palm?