As Walker impaled herself on the spear, the mandibles of the cross guard would clamp down, small points hopefully improving its grip. She would likely be able to feel the tip break off inside her flesh, followed by a strange bubbling sensation as it began to dissolve. This would ideally dump quite a large does of muscle relaxants and sedatives into Walkers bloodstream. The mandibles should hold for a bit, giving Cruach the opportunity to wrench the spear sideways, attempting to throw Walker's balance off. The resistance from the mandible cross guard would cause the haft of the spear to bend significantly, before the mandibles would snap and allow Walker to continue forward. Cruach would use the moment afforded to her to spring sideways through the open door next to her and into a moderately sized room with a few piled boxes, and a notable lack of windows.
The attempted grab wouldn't be completely unsuccessful, managing to catch a segment the greyish armor on Cruach's leg, though this wouldn't provide a solid enough grip as it would slough off with a rather disturbing meaty sound. This would leave Walker holding a segment of armor, a seam having opened to allow it to slip free, the inside covered in a spongey sort of flesh-like tissue. The exposed section of Cruach's leg teams with the fuzz of tendrils as they go to work replacing the armor panel, the cloth of her costume only briefly visible underneath.
"I was hoping you could see reason, that this could be resolved without going too far, but this, this proves you're beyond reason, that there's no point trying to convince you of the truth.*
Adrenaline pumps through her veins, among other chemicals tailored to act as stimulants. She'd have to be far more serious about this if her opponent was so readily willing to be impaled, and still able to make such an effective attempt at an attack afterwards.
The armor on the rest of her body fills in entirely, including the replacement of the missing segment on her leg. The last channels, pathways, and glands finish forming in her hands and feet. She puts distance between her and the doorway, moving closer to the center of the room, her steps quick and well placed. Everywhere she steps, a flurry of fuzz and tendrils follows, depositing a carpet of chitinous, fleshy, something on the ground. Bladders swell and deflate on said carpet, and a faint hiss fills the air as a cloud of thick white vapor begins to form. The smell of must and decay only grows stronger as with a similar flurry of motion a light blade resembling a scimitar of bone and chitin forms in one of her hands, small sacks filled with some sort of fluid line the back of the blade.
As the vapor fills more and more of the room, she takes a practiced fighting stance.