Ya it does not matter how far away she is pushed. But as a viewer those tiny details make a difference. The setup, the staging of the situation should speak too. Its analogous to a crime scene. And especially with virat an ACP, i not only want him to lose it because he is emotional about Sai, but i want the police officer in him to see the situation and see the obvious. What Sai actually getting pushed and falling a little further away will do is that the police officer Virat knows immediately that it wasn't just an accident and then the husband in him reacts with rage at the thought that pp could be so blind in rage that she actually pushed Sai and made her fall, het hurt.
I guess it was an accident though according to KD too. So that is what we will get from our Vanku baba, king of copy paste.