Marsh Hawk in Flight

This is actually a story about a merlin and marsh hawk I saw hunting "together" the other day. I spotted a merlin on sunday chasing, or what I thought was chasing a marsh hawk. It turns out the merlin was using the marsh hawk as a flusher and was following it closely waiting for some small bird to flush. This went on for 20 minutes before I finally saw the merlin catch a small bird the marsh hawk scared up. I got an image of the merlin with a small bird but it was so far off it wasn't worth posting. I got this image of another marsh hawk on the same afternoon. It must have just missed catching something and came up was grass only....Canon D20, 600mm, + 1 exp comp, iso 400, thanks for looking.