
One places a block, stands on it, places the next, and goes up to 24 blocks that way.

A wall only buys time. Digging under, bridging a gap and swimming are all open to them too.

Placed blocks crack as they age and are gone about thirty seconds later, so the wall looks untouched by the time you get there.

Break line of sight and they walk to where they last heard you. Move, or be found.

