Start the disc with the stationary receiver(R2). B1 should start in the middle cone.
B1 make a cut to (16) catch the disc from R2.
B1 throws the disc back to R2 and cuts to (17)...
B1 plants at (17) and cuts to (15) where they receive the disc from R2.
B1 throws the disc back to R2 and cuts to (17)...plants...
...and cuts to (16)... where the drill begins to repeat itself.
Do this drill and have B1 make 10-20 throws.