I did have a thought late last night that by 'behind' the horse, he meant to the left of its tail rather than how I took it to be (rising behind its back).

But even if he did mean that, it doesn't really demonstrate much in terms of meaning or intention does it?

And aye, i've never thought it's head resembled a horse! How could it?

The whole thing looks more like a map to me. But that could be wishful thinking.