I watched it back and no way does he miss with that first shot. Like Daryl said it appears to hit the gut. The second shot looked fairly well placed. I have not bow hunted bear but from guiding bow hunters on buffalo I would say the reason he did not take another shot was that if you do put in a good shot and the animal is unaware of your location it can be risky to take another shot and give away your presence. Not just for the danger of being charged but often an animal when hit with an arrow may not realise what is happening. If you go for another shot and are noticed the adrenaline kicks in and they may travel way further and faster than one shot well and unaware of you. If you are sure of your shot sometimes it is better to sit tight. At this point the guide would have been in control of what was happening. If you expect instant one shot kills probably best not to use a bow.