["At once" is the only answer. Hayame trots after Dimitri, and this time she clips her pace even further, not outpacing him as she easily had on the way here. Why? Because unlike arriving at this point... there was nothing she could do to reach the object she'd detected without him. Arriving early would be pointless when the answer to his question was,]
At the top.
[Now, if they could just reach the bottom and ascertain just how high the distance was to that top...]
no subject
At the top.
[Now, if they could just reach the bottom and ascertain just how high the distance was to that top...]