When he got over that he was not much better off.

The slope above was endless and grew steeper, more difficult toward the top.

Slone knew absolutely that no horse could climb over it.

He grew apprehensive, however, for Wildfire might stick up there on the slope until the line of fire passed.

The horse apparently shunned any near proximity to the fire, and performed prodigious efforts to escape.
"He'll be ridin' an avalanche pretty soon," muttered Slone.
Long sheets of sand and gravel slid down to spill thinly over the low bank.