[Rebelgecko]

If pieces got bumped into a higher apogee wouldn't their orbit end up with a lower perigee as well? If so I think that might actually be better for deorbiting quickly

[meowster]

As long as it doesn't hit something while it's in apogee.

[bryanlarsen]

One collision might be barely statistically possible. Enough collisions to start Kessler takes a lot more than one.

[meowster]

Isn't it the Kessler Syndrome when the debris from the first collision creates the subsequent collisions?

[throw9474]

Diffuse debris while at higher orbit can take out satellites in those higher orbits (like Iridium, Kuiper, etc..)