TLDW: Depends on how many hours you will fly per year. 50 Hour/Year - $89000 per year. 100 Hours/ Year - $131000 per year. 200 Hours/Year - $215000 per year

They are showing three things. Spring loaded mechanism. String guided arrows with small metal prongs and wooden armor. Air cannons for shooting a lot of arrows at the same time.

Yes. But they are explaining why it is much more important for rockets compared to regular movies.