upon seeing
Con el horror se me pusieron los pelos de punta al ver la escena.
The horror made my hair stand on end when I saw the scene.
Upon seeing the policeman, he fled.
He screamed when he saw a snake.
El paciente se desmayó al ver la sangre.
The patient fainted upon seeing the blood.
Tom se sonrojó al ver a Mary desnuda.
Tom blushed when he saw Mary naked.
He fled when he saw the policeman.
El corazón de Mary revoloteaba al ver a Tom.
Mary's heart fluttered when she saw Tom.
Ella lloró al ver el cadáver de su padre.
She cried when she saw her father's corpse.
Tomás no se pudo controlar al ver a María besando a Juan.
Tomás couldn't control himself when he saw María kissing Juan.
El gato se fue corriendo al ver al perro.
The cat ran away when it saw the dog.