Despite propping myself up, I'm proned.

...

Suddenly, the ground gives out from under you as you fall into a shallow pit filled with tiny spikes!
Some scratched glaes full plate partially deflects the onslaught of the puncture attack.
... 1 point of damage!
Strike pierces thigh!
You instinctively drive your illthorn greatshield into the ground and prop yourself up!

Roundtime: 3 sec.
A halfling rogue quickly approaches!
A human thief quickly approaches!
PR>

...

Either I shouldn't be prone, or the messaging is wrong.