the general tendency to use indirect objects for people also occurs when the speaker wishes to convey respect. the second person formal "usted" is conjugated the same as the third person, hence some speakers use "lo/la/los/las vi" "i saw him/her/it/them" when speaking about a third party or an object, but "le/les vi" "i saw you" when the pronoun is intended to represent "usted/ustedes". this is known as "leísmo de cortesía" and is permitted by the rae.