At the first grab, sometime Mystic, Berserker,...can standup so fast. About 10%
At the second grab, if y use skill "fearsome tyran" after first grab. Y will fail at second grab, about 40%, if your enemy is AM,Invoker 80% y will fail at second grab at the field.
It is not about -attack speed of enemy, because they still down but second grab still fail. I dont use move button when grab. Please check it. Thanks