Erfworld 155 -- tBfGK 142

[Glome]

Because sizemore and wanda did not DIRECTLY kill the troops. They indirectly manipulated the terrain into something which an army cannot survive upon. So the land killed them all not sizemore.

Or a simpler explanation is that they fled before the volcano went off, you don't level if you flee, which is why Stanley was mad at Parson for using hit and run tactics.