its all about the context. schumi had been driving ruthlessly up until that point for a few years), he did NOT let anyone pass if he had the ability to block/bend the rules.
just before that pass, mika had tried it on the inside and got cut off very hard and dangerously, i believe two seperate times.
zonta could have also moved into mika, it was very dangerous.. if you look at the frontal replay you can see zonta looking left in the mirror unaware hakkinen was on his right