Shado takes the bow to shoot a branch from a tree, then shoots the falling branch to pieces. The quiver with arrows is standing at least 8 steps away from her, and it is not shown that she grabs the arrows before she shoots them. She just has one arrow all of a sudden and fires it, then has a second arrow and fires that.
An embolism of air cannot be caused by putting pressure on a point of a nerve or vein in the arm (or leg): air must be introduced into the system somehow. In addition, embolisms of any sort are not painless.
Laurel cannot appoint herself as guardian to the boy. While she claims she can get a judge to sign a custody order for her, it would be unreasonable of a judge to grant custody of a traumatized 7 year old boy to a single woman with no history of child care experience of any sort when there are licensed foster homes available.