A sudden downward drift of the wind brought the barking of the dogs to them clearly.
Less than half a mile away Langdon's pack of trained Airedales were hot on the scent.

Their baying was filled with the fierce excitement which told Bruce and Langdon, a quarter of a mile behind them, that they were close upon their prey.
And even more than it thrilled them did the tongueing of the dogs thrill Thor.

Again it was instinct that told him a new enemy had come into his world.

He was not afraid.

But that instinct urged him to retreat, and he went higher until he came to a part of the mountain that was rough and broken, where once more he halted.
This time he waited.