Toothless's Guilt

I'm only curious: How'd y'all interpret Toothless's emotions when he came out of his mind-control in HTTYD 2 and as Hiccup pushed him away, for example? What do you think he was "thinking" about, per se?

(Not mine, Dreamworks!)

Fun fact (if it even is relevant): What Culture once included this plot twist on their Best Movie Plot Twists of 2014 list.