Final answer:
When Walt has an avoidant attachment style with his father, Michael, he will likely show indifference or avoidance when Michael returns.
Step-by-step explanation:
When Walt has developed an avoidant attachment style with his father, Michael, he would likely respond to Michael's return by showing indifference or avoidance. In avoidant attachment, the child is unresponsive to the parent, does not use the parent as a secure base, and does not care if the parent leaves. The child may react to the parent the same way they react to a stranger. When the parent returns, the child is slow to show a positive reaction. This response is often a result of having a caregiver who is insensitive and inattentive to their needs.