I'm not surprised because Inter Milan defender is careless and busy to attack. Inter Milan even almost lost in minute 90 after Pellegrino received Valeri's pass on the left. This is insane because Inter will get 3 points for sure on 1st half, but gone after defender mistakes. So with this result, Napoli will have a better chance of to scudetto, they have 1 different point if they can overcome Bologna next. I don't know why it always happens at the end of the week. It's the same as another league where the big club can not get the maximum points. We'll see the club in 2nd and 3rd place will shift that position on comon weeks.
It looks like Inter Milan's defense was not prepared and their focus on attacking made them make mistakes. They almost lost in 90th minute because of defensive mistake which shows this clearly. Inter Milan fans are frustrated because they had strong lead in first half but it was lost due to careless defending. This result helps Napoli chances of winning championship as they now have one point lead. Big clubs losing points at end of week is worrying trend and it is interesting to see how league standings will change in coming weeks. If Inter Milan keeps having problems with consistency teams in second and third place might be able to pass them.