Be mindful, that "sia" here means "his own", referring to "he" the subject. It does not relate to a third party.
How to know when you have too many languages: when I translate this on my mind from Esperanto to Spanish to English...... wtf
Sometimes I even translate from x to y to z to a.....
Fakte, mi ne povas traduki "pregxi" direkte el esperanto al la angla... mi devas uzi la hispanan!