That snake was dumped in the open and followed. When flight fails, fight kicks in. Note the snake attacks then quickly retreats, all its doing is giving itself an opportunity to get the hell out of the way of the clown with the camera.
Chase isnt the right word for this and you wont see it in a wild snake that has a way to escape. The stories of Tigers chasing people across creeks etc are just plain rubbish.
As the "clown with the camera" let me explain what happened in that video. I caught the snake at the bush hotel I was working at and relocated up to the airstrip away from the hotel, both for the snakes safety and that of the hotel patrons. I saw it as a great opportunity to try to get some video footage, never expecting it to turn out quite how it did!
I chose the airstrip because it was relatively open and I thought the snake would have little chance of escaping quickly, hence enabling me to get more video time.
It's clear that when I tipped the snake out on the ground it tried to move away from me, all it wanted to do was get away. A couple of time I approached closely as it moved away and it stopped, gave a mild threat display then kept moving on. This should have been a clear enough indicator to the "clown with the camera" to back off. However, I kept pushing the boundaries and going closer so of course the snake feels like it's being threatened or attacked, and with nowhere to hide or escape it then has a serious go at me before trying to escape me again. Had there been a pile of rocks or a hollow log nearby it would have been straight into it to try and avoid me, but it really was caught out in the open. Note how quickly it disappears once it finds an escape down the ant burrow.
Even though the video is an example of a snake having a go at someone, I think you'd be hard pressed to call it being chased by a snake...what looks like a lot of ground covered at speed in the video is probably only 3 or 4 metres when it's coming at me......there's no way you can call that a chase (unless your'e the size of a skink!)
I tried to make it clear in the video that snakes do want to get away if left alone. Think about it; what reason could a snake have for possibly wanting to attack someone and put itself at considerable risk doing so. The only reason a snake attacks something is to eat it, or if it feels threatened. If the snake feels threatened you can remove the threat by backing off...quite simple.
I've had many other snakes "come at me" sometimes shooting between my legs from a metre or so away; but it has always been into a bush or a hole behind me. Surprised in the open they head for the nearest escape route which just sometimes happens to be close to you. It's the same thing with Frill-neck Lizards and Tree Goannas, if they are startled in the open, they head for the nearest tree to climb and escape and sometimes that "tree" can be a person!
So to the OP, have a considered think back over the circumstances and I think you'll find the snake was probably just trying to get back to his favourite hole as quickly as possible, and that just happened to be in your direction.