Camera pans from Shinji to Rei’s back
SHINJI (BACK):“A bond with my father?”
REI (BACK):“---With everyone.”
SHINJI (BACK):“You're strong... Ayanami.”
REI (BACK):“I don’t have anything else…”
Here, we also have the point where Shinji starts admiring Rei, at first, in an intellectual sense. To Shinji, this is an impressive strong will.