RE: It only takes one arrow.....
One arrow, not for me.
I spine hit a deer once and needed another arrow to quickly finish it.
That could happen again; if I was really lucky another curious (stupid / young) deer might come to investigate the deer I'd already shot and I would need arrow #3. It would likely duck at the shot (being suspicious about the dead deer laying there) and I would then need a 4th arrow.
Quik 4 quiver.