en le voyant

on seeing him/it

→ en
phrase Rare #46,246
on seeing him/it Means “when seeing him/it” or “while seeing him/it.” The pronoun can refer to a masculine person or object; it changes with the object: en la voyant, en les voyant.
FR: En le voyant arriver, j'ai tout de suite compris.
EN: When I saw him arriving, I understood right away.

Qu'avez-vous ressenti en le voyant, Clarice?

What did you feel when you saw him, Clarice?

Sur la rivière, je pensais qu'en le voyant je saurais quoi faire.

On the river, I thought that seeing him would tell me what to do.

— Apocalypse Now (1979)

En le voyant, j'ai pensé à toi.

When I saw him, I thought of you.