This last panel anticipates the attack on London by six months, the attack on Paris by four months, and the attack on Copenhagen by three months.
Since the flame gun's flame seems to be an area of effect, it should not just miss Sampson like that (if he saves vs. science, he would take half damage). He must be buffing himself defensively with a power like Imperviousness.
Lifting a small tank is possible with the Raise Trolley Car power, which buffs his encumbrance limit. Mopping up the soldiers by hand could be an example of Multi-Attack but, really, if he's operating as a 6th level superhero (which would take 5 brevet ranks this early in his publication history), then handling some 1st level fighters should not be a problem for him, even un-buffed offensively.
Making 10-12' leaps just while covering horizontal distance does not seem to warrant using a power and could easily just be flavor text.
It is very unclear how the gas gets from this central tank out to the field, especially since there are no hoses or pipes leading from it. I guess this was more of a refueling station?
Unless the gas inside that tank is helium, it likely far exceeds the 720 lb. limit of the power Extend Missile Range III. This feat could be duplicated by combining any of the Raise buffing powers with the power Wreck at Range.
(Scans courtesy of Comic Book Plus.)