I do not feel like reading through all of the replies, so sorry if this link has already been posted, but here is the last 8 minutes of that match.
https://www.youtube.com/watch?v=_y12sL1oR2s
Hall missed 2 very easy shots. It sure does look to me like he dumped. This is a very seasoned player. These pro's do not miss easy shots like that (for any kind of money). The pro's have much stronger mental games, and just do not make silly errors like that (I do not think).
If I wanted to spend the time I would show you hundreds of easy shots missed by pros just by going through easily available youtube matches.
I sat ten feet from Tony Ellin and watched him miss the easiest cut to the corner you could imagine against Hopkins, resulting in an $8000 loss in the difference in prize money.
In fact, just a few weeks ago Karl Boyes missed an easy 8 ball in the World Cup's final game. Luckily for him the result was safe and so they won that game and the tournament. Had the odds been 20:1 for Holland winning then we might be talking about Karl's "obvious" attempt to dump the match instead of talking about how anyone can be affected by nerves at any level. Even a seasoned player like Karl can get the yips when there is $30,000 on the line.