The answers are:
He is startled because he mistakes his reflection for an intruder.
He doesn’t recognize himself because he hasn’t looked in a mirror in years.
"'Agua Viva,' a Sculpture by Alfred Gonzalez” is a story wrote by Jack Agüeros tells the story of Fredo, a hermit and mentally disturb man that hasn't shaved or bathed in five years, in this part he break the bathroom’s mirror, due to, he did not recognize himself in the mirror, he have not look at him in years, so he thinks that the person in the mirror is an intruder.
