Final answer:
During the hunt, Lassiter got injured with a long furrow above his left temple. Simon tells the boy to lie still for three days to allow the wound to heal and prevent hemorrhage.
Step-by-step explanation:
The person who got injured during the hunt is Lassiter. He has a long, bleeding furrow above his left temple. Simon tells the boy to lie still for three days to help the wound heal and for the danger of hemorrhage to be over.