Terigmar does not seem to be employing any deception in his words. The more time you spend with him, the more certain you are that he is dead and does not realize it. He tries to offer you something to drink, but it takes him a while to find something safe for consumption.
"Terigmar the Tireless thanks you for your kind offer of help. It appears you are in a bit of a hurry, which is a shame. I would be proud to explain some of my ongoing research to you," he says, still concentrating most of his attention on Akodo. "And I should introduce you to Hisst, who is probably lurking around here invisibly. Oh, and Dorkin, who's probably hiding in the bed."
"But if you must rush, I have a specific request for you. I have been trying for some time to learn the spell time stop, but so far I haven't had any luck. If you could teach me the spell, or acquire it on a scroll, I could make it worth your while."