Expanding Life

What is the ultimate decay pattern of various perturbed agars, especially the block agar and the vertical lines "agar" produced by the spacefiller (max)?

What is the pattern formed when a gun (or practically, a rake emitting gilders or spaceships in the opposite direction of the rake's travel) interacts with small debris?

Both of these questions are best answered by simulating the gun or unperturbed agar beyond the edge where anything interesting is happening.

Tangentially, how does metacatacryst work?