Just getting out of range of the conscripts is rarely an option. If you have grens in cover guarding a capture point, conscripts can just oorah run up and HTD in the capture zone. Moving from your cover A.) exposes you to more fire until you get out of range. and B.) lets the conscripts cap the point / take the cover.
On a second note, I was personnaly under the impression that Conscripts who hit the dirt were much more vulnerable to flame, mortars and nades... Just as if they were in cover. Isn't that correct?
I think the only thing that makes them more vulnerable is they cannot move for a few seconds after you activate the ability. So it is easier to hit them with nades or mortar, but they do not take any extra damage.