Had he seen heaven opened?
or another place?
So momentary was the vision, that he scarce knew what he saw.

There it was again! Lasting but for a moment: but long enough to let him see the whole western heaven transfigured into one sheet of pale blue gauze, and before it Snowdon towering black as ink, with every saw and crest cut out, hard and terrible, against the lightning-glare:--and then the blank of darkness.
Again! The awful black giant, towering high in air, before the gates of that blue abyss of flame: but a black crown of cloud has settled upon his head; and out of it the lightning sparks leap to and fro, ringing his brows with a coronet of fire.
Another moment, and the roar of that great battle between earth and heaven crashed full on Elsley's ears.
He heard it leap from Snowdon, sharp and rattling, across the gulf toward him, till it crashed full upon the Glyder overhead, and rolled and flapped from crag to crag, and died away along the dreary downs.

No! There it boomed out again, thundering full against Siabod on the left; and Siabod tossed it on to Moel Meirch, who answered from all her clefts and peaks with a long confused battle-growl, and then tossed it across to Aran; and Aran, with one dull, bluff report from her flat cliff, to nearer Lliwedd; till, worn out with the long bufferings of that giant ring, it sank and died on Gwynnant far below--but ere it died, another and another thunder-crash burst, sharper and nearer every time, to hurry round the hills after the one which roared before it.
Another minute, and the blue glare filled the sky once more: but no black Titan towered before it now.

The storm had leapt Llanberris pass, and all around Elsley was one howling chaos of cloud, and rain, and blinding flame.

He turned and fled again.
By the sensation of his feet, he knew that he was going up hill; and if he but went upward, he cared not whither he went.