I've spent a LONG time wrestling with the passes for shot 02, the main issue is trying to get the shadows for the town to soften accurately, while retaining a stylistically sharp shadow for the dragons which are high above the landscape. If rendered accurately the dragon shadow would be extremely blurred due to the penumbra softening the edges.
I eventually managed to render out two seperate shadow passes and composite them together to achieve the desired effect.
I then precomosed this shadow pass and treated it like a single shadow pass to composite with the rest of this shot. I've still got a lot more to do on this shot, particularly at the end when the ground burns away to reveal shot 03, but at least this problem is solved!