When Bademagu heard this, he was grieved, and in his wrath he could not keep himself from attacking Mordred-although it was a base deed, for Mordred was unarmed and on foot, while he was armed and on horseback-and striking Mordred in the chest so that the lance emerged on the other side. He knocked Mordred to the ground so badly hurt that he expected to die, and Mordred shed so much blood that all the ground around him was covered in it. When the king saw him like this, he thought he was dead and therefore did not want to strike him again, and he left him and went away with great sorrow for the maiden who had died because of him

[...]

When Mordred heard himself called, he opened his eyes and recognized Gawain; he was happy to see him and said, "Brother, I'll recover quickly if you avenge me on the falsest knight I ever met, who wounded me, as you see, treacherously, for he was armed and on horseback and I unarmed and on foot."

The Post Vulgate Cycle