What's the point of fire arrows in Mordor?

This may be a Mordor orc or a goblin or something. I don't really care. But what I do care about are the mistakes!

1. This bow is stolen from Lara Croft. The young version, with more clothes and less boobs than usual. Also less of a bow, since it's made out of a bunch of sticks. It would be quite easy to make a bow from one piece of wood, but maybe orcs want to make everything crappy on purpose. Then again in many fantasy lores they are good craftsmen and smiths, but it doesn't really show since their products are terrible and typically unusable crap. Like this bunch of sticks here.

2. Are all these arrows used thousand times since the fletching of orc arrows is always so bad? Too little space between the fletching and the nock maybe be half the reason for that. And what is the purpose of keeping the arrow between teeth? It would seriously be in the way of the bowstring while shooting, and getting the arrow from there is not in any way faster than from some other places. I would even guess it would be slower to get it from there. Faster would be to keep several arrows in your hand already, either the bow hand or the string hand (the latter is even faster of the two).

3. He has a back quiver and a hip quiver, but why? If you are used to a hip quiver, why to have also a back quiver, isn't it just confusing? Why not two hip quivers, people (and orcs) have two hips after all?

4. The grip is wrong, two fingers used instead of three and the hand is palm down when it should be the other way around in this position. Also nobody would want to spend their energy unnecessarily by pulling the string half way back at this point when the bow isn't pointing anywhere near the direction of shooting.

5. Fire arrows. Stupid fire arrows again. What are he going to set on fire? The rocks? The volcano? It is already on fire! And there's nothing else that can be burning in a range of miles around him. The land of Mordor is completely barren. Fire arrows were not shot against people, since it's completely unnecessary, people die perfectly well from hits of regular arrows, and actual fire arrows would do less damage to people than normal arrows, because of the structure of their arrowtips.