Though it isn't capable of true flight, at least as far as he knows, the dragon form is alarmingly quick for its size. He can't completely dodge Sans's attack at this range, but he won't take the brunt of it, scrambling across the section of the wall that the laser carves a furrow into. The blue light sears his side -- the same one that had been cut into, now still patches of stone against gold scales -- and he roars with pain, spitting a gout of fire at the flying skeleton. At the very least, he knows now that an ability to turn things into rock with his lasers isn't an ability Sans has acquired as well.
But Lambert won't waste time waiting to see if it dodges it or not: descending is still the most important thing, or at least getting to a level where he knows the fall won't damage him. He moves like a giant lizard, legs flailing and claws puncturing into stone as he shimmies his way in a zig-zag pattern down the wall, only pausing to roar flame at Sans every now and again. Look alive, Warden!
that fucking icon, i want to imagine that's exactly what happens
But Lambert won't waste time waiting to see if it dodges it or not: descending is still the most important thing, or at least getting to a level where he knows the fall won't damage him. He moves like a giant lizard, legs flailing and claws puncturing into stone as he shimmies his way in a zig-zag pattern down the wall, only pausing to roar flame at Sans every now and again. Look alive, Warden!