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If you're talking about the Shakespeare play,

He's worried that Antony will stir up the crowd against the people who murdered Caesar. He's right to worry, because that's exactly what Antony does!

he's in fact stabbed and not using a combat. often b/c Brutus and Cassius are in basic terms 2 of the like a variety of of people who have been stabbing him. Theres additionally Casca, who i believe makes the 1st stab, and many others. Caesar could not have fought back. there have been too many conspirators.