Later enemies aren't nearly so forgiving. In the cramped, dilapidated interior we saw Hayden stalk through, he ran into spooky guys who sprayed inferon, a radioactive gas that messes with mutants like Hayden something fierce. When these masked creeps stepped into view and started the spray, the action onscreen suddenly started shaking, distorting and flashing bright colors. Inferon also disrupts Hayden's powers, so you'll apparently be reduced to shooting blindly with whatever guns you've got on you until the effects wear off.
These guys were nothing compared to what waited at the end of the demo, however. Hayden isn't the only one who's been mutated, it seems, and he'll run into monstrous creatures with powers similar to his with increasing regularity. The one we saw seemed especially threatening, tossing a few of the militia guys across the room before leaping at Hayden. Sadly, we didn't get to see it in action beyond that, as the demo ended. But trust us when we say it looked really cool.
The good news is that fighting these things will grant Hayden new abilities and help him evolve his powers. How, we're not exactly sure, but we're looking forward to finding out more as Dark Sector's late-2007 release date gets closer.