The initial rhythm is ventricular trigeminy.
As far as the other one, I agree that the ectopic focus must be high up in the ventricles, but its definitely VT. The ectopic origin, being high in the ventricle, as well as this patients lack of medical hx may account for his ability to compensate so well, hence his maintaining BP and mental status. Those 80 beats that are perfusing may be enough to maintain homeostasis....for now.
Nevertheless, this patient did have a syncopal episode, for one reason or another, and I prefer to aggressively treat VT w/ pulses. Hi-con O2, IV, and a dose of your favorite antidysrhythmic. (In NYC amidarone is now in protocol) I would definitely monitor him closely and if he became hypotensive, AMS, or otherwise unstable I would cardiovert.
I would initially avoid a fluid bolus unless you could tell me that the patient has no other complaints and clear L/S. I'm sure the experts will correct me if I'm wrong, but the initial trigeminy and syncope may be a signs of impending failure, plus with his stable pressure he doesn't really need it.