Help me find the fastest mate Paul Morphy would have used?

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Lord_Ward
Hi Guys,
First post on the forums and I'm a beginner or novice player at best. I'm reading David Lawson's, Paul Morphy, The Pride and Sorrow of Chess.
I enjoyed looking at this game a 12 year old Morphy played against Rousseau Emmanuel in 1849 and I was hoping some players better than myself may help me see the potential end games or fastest mate.
To me it looks like Rousseau can fend off Morphy for awhile longer with Be6. How would Morphy have likely sealed this one up?
If I'm breaking forum rules in anyway by posting this I apologize and I'll take this down. Otherwise I would appreciate some discussion from more advanced players on this game.
Thanks!