After moving and before attacking, roll the 20-sided die. If you roll a 15 or higher, you may move the same Dreadgul Raiders again.
I found 2 issues in Heroscape's list:
-It's not the "Gorillanators", but the "Gorillinators";
-For the power Berserker Charge of the Dreadgul Raiders, we should read:After moving and before attacking, roll the 20-sided die. If you roll a 15 or higher, you may move the same Dreadgul Raiders again.