in Moon Mullins (St. John, 1949 series) #8 (April 1949) [The reprinted story was given a title, unlike the original.]Especially the face in close up on the last page is a sure signs of Hart, a bit heavy nose with black shade, like his K-9 story in "Dynamic Comics" #3. Also the movement in fistfights.
The faces with round eyes, and the very exited movements, is probably Madden, who is credited on this feature by Jerry Bails' Who's Who.