It's a cup game, Chelsea were playing poorly and Mourinho wanted to make a change. In a cup game, especially away from home, you may as well lose 6-0 as lose 1-0, so Mourinho went for it. He wanted a positive response from his team. A draw was no good, he wanted a team that could go out there and score at least 2 goals and win the match, or go down trying.
He made the right changes, and whether it be at half time or 15 minutes into the half, doesn't really matter. You cannot legislate for red cards and serious injuries, and you should base how you plan your tactics based on the fear that you might get an injury.
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