Ancelotti told his players about his "front-runner theory" so that they did not have to worry about the two-goal gap. As long as we keep putting pressure on them, those two goals will become a burden on our opponent instead. Everyone thought the manager made a lot of sense. Being in the lead was not necessarily a good thing, especially for a rookie team like Nottingham Forest with no experience of winning a major tournament. If they could not secure their two-goal lead, it could incumber them at the last minute.
After the second half began, AC Milan saw that Nottingham Forest did not intend to play offense with them, so they besieged the Forest team's penalty area and bombarded them.
The Forest players were well acquainted with this sort of situation. They knew how to deal with the enemy's attacks.