I've watched the play a couple times, and still have no idea what the plan was. I think Mal was in an awkward position. He's either running his defender up into Cooney from behind, and he was already kind of close, or heading into the middle, which was already jam packed.
Still not sure what Lydon was doing - but I would imagine he was trying to leave that side of the court open for the drive to the rim, and then trying to time the distance to crash the boards hard.
I think Cooney coming to the stop, and then pulling up was the big shocker for all involved. Everyone else seemed to be intent on keeping their defenders back away from the rim.
I really have no idea though.