When about a third part of the night had passed Grettir heard a loud noise.  Something was going up on to the building, riding above the hall and kicking with its heels until the timbers cracked again.  This went on for some time, and then it came down towards the door.  The door opened and Grettir saw the thrall stretching in an enormously big and ugly head.  Glam moved slowly in, and on passing the door stood upright, reaching to the roof.  He turned to the hall, resting his arms on the cross-beam and peering along the hall.  The bondi uttered no sound, having heard quite enough of what had gone on outside.  Grettir lay quite still and did not move.  Glam saw a heap of something in the seat, came farther into the hall and seized the cloak tightly with his hand.  Grettir pressed his foot against the plank and the cloak held firm.  Glam tugged at it again still more violently, but it did not give way.  A third time be pulled, this time with both hands and with such force that he pulled Grettir up out of the seat, and between them the cloak was torn in two.  Glam looked at the bit which he held in his hand and wondered much who could pull like that against him.  Suddenly Grettir sprang under his arms, seized him round the waist and squeezed his back with all his might, intending in that way to bring him down, but the thrall wrenched his arms till he staggered from the violence.  Then Grettir fell back to another bench.  The benches flew about and everything was shattered around them.  Glam wanted to get out, but Grettir tried to prevent him by stemming his foot against anything he could find.  Nevertheless Glam succeeded in getting him outside the hall.  Then a terrific struggle began, the thrall trying to drag him out of the house, and Grettir saw that however hard he was to deal with in the house, he would be worse outside, so he strove with all his might to keep him from getting out.  Then Glam made a desperate effort and gripped Grettir tightly towards him, forcing him to the porch.  Grettir saw that he could not put up any resistance, and with a sudden movement he dashed into the thrall’s arms and set both his feet against a stone which was fastened in the ground at the door.  For that Glam was not prepared, since he had been tugging to drag Grettir towards him; he reeled backwards and tumbled hind-foremost out of the door, tearing away the lintel with his shoulder and shattering the roof, the rafters and the frozen thatch.  Head over heels he fell out of the house and Grettir fell on top of him.  The moon was shining very brightly outside, with light clouds passing over it and hiding it now and again.  At the moment when Glam fell the moon shone forth, and Glam turned his eyes up towards it.  Grettir himself has related that that sight was the only one which ever made him tremble.  What with fatigue and all else that he had endured, when he saw the horrible rolling of Glam’s eyes his heart sank so utterly that he had not strength to draw his sword, but lay there well-nigh betwixt life and death.  Glam possessed more malignant power than most fiends, for he now spoke in this wise: