Well I'd have thought you can still block charging any unit to their front with a unit of Terradon Riders (particularly if the Terradons are...
Post 2 - Army List Organisation and Characters Characters: Up to 1 Slann, Up to 1 Saurus Oldblood or Skink Priest per 1000 points, any number of...
I wouldn't say it kills them, because the one aspect that isn't so bad about Impetuous or Frenzy in TOW is that you get to choose your charge...