page 212 of 960 of Sir Thomas Malory: Le Morte Darthur: The Definitive Original Text Edition

212:

Launcelot wins (well, duh) and makes them swear (again) to go to Gwenyvere. Raynolde (one of these knoghts) knows Launcelot is not Kay, but in Kay’s armor Launcelot is giving Kay the authority of state and force. There is no fighting the brotherhood of the Round Table.

Still in Kay’s armor he fights Ector, Gawayne, Uwayne, and Sagramoure – who are part of the Round Table so there is still in-fighting.