Using the Mass Production Evas, SEELE created an Anti-AT Field which shattered every single AT field on the planet. Without AT Fields separating people (symbolically the fear of rejection and closeness that keeps people apart--the "space between us"), everyone merges into one single consciousness inside of the Tree of Life. Everybody can hear everyone else's thoughts.
Asuka is a bully, plain and simple. She's clearly being eaten alive by her own insecurities, so she tries to reaffirm herself by knocking Shinji down both emotionally and sexually. It's clear that Shinji, as a teenage boy, badly desires carnal knowledge of her. Asuka, being completely immature about it, uses her sexuality to tease and degrade Shinji. It's no surprise that after finally being exposed to her raw mind that Shinji finally has enough and decides to stand up for himself.
Bookmarks