Harry Greb at his Greatest.

Just as an example, pre-fight write-up from
1925-02-06 Brooklyn Daily Eagle (page A2)

The contest promises to be, as one writer has happily expressed it, a battle of legs. Terris, in the opinion of many experts, is the fastest man in the lightweight class since the Marquis of Queensberry rules were formulated. Mandell is, in some respects, the closest approach to Terris in speedy footwork. Both rely upon their feet to get in a punch, and they rely upon the said feet to escape a punch.

Terris should be called a "fencing master," rather than the "dancing master," remarked a fan who has seen him many times. The East sider has the movements of the fencer, rather than of the boxer. He is in and out with his left hand. He can get away from danger faster than any other man in the ring today, and can come back equally fast to shoot through an opening.

...

Mandell is exceptionally shifty with his feet, but does not have the springy, jumpy action of Terris. He glides instead of springing, and is strong for aggressiveness. He is constantly gliding forward, and is not so prone to center so much of his footwork upon getting in and out.