I purposefully designed it that way. It makes use of WARP's particle-swapping behavior to bypass even the strongest unmelting materials, and the WARP purposefully survives for longer the less open space it can move around in, meaning it inexorably escapes anything short of utility elements like DMND.

I spent a few sleepless nights fixing it to do that properly =P Glad someone appreciated it for more than a decorative stoplight.