Heero is not unfamiliar with this kind of jumpiness, having certainly been present for the throes of their own universe's war. Like Duo, he is extremely difficult to surprise, but he can spook just as badly. If and when someone manages it, they are typically rewarded for their efforts with Heero's pistol aimed between their eyes - Duo not excepted. Yet that knowledge doesn't stop Heero from sneaking up on him, the 'perfect soldier' quiet by nature as much as he is simply inconsiderate of Duo's blood pressure.

Nevertheless, Heero takes note that Duo is more high-strung than he recalls. In fact, everyone on Thesa seems to be a bit on edge. Which... makes sense, given what he's seen and experienced of Ysverai on the space station's screens.

"Apparently, but I don't remember anything," Heero answers, gracefully dodging the bit of muck Duo flings at him, though a glop of it still slogs off from the main chunk to land wetly on his shoulder. Even stony-faced Heero has to make a look of distaste when he wipes it off, leaving behind an unsightly smudge of gunk on his arm.

Then he hums noncommittally, having absolutely no frame of reference for what it's like to fight undead dragons in Gundams, so he'll have to take Duo's word on it. All signs point to it not being fun, given the damage and the gunking up that Deathscythe has taken.

"Do you want help?" Heero asks as Duo gets back to dredging up the muck. It's a rare offer, but... these are rare circumstances.