Antony is the bike rider who is aware of the risks, and takes precautions such as wearing a helmet. He is confident enough that he rides straight and true, without injury. Antony is confident in his purpose of avenging Caesar's death and has no second thoughts: "Now let it work: Mischief, thou art afoot,/ Take thou what course thou wilt" (III, ii, 261).
He also realizes the risks and takes cautionary measures to protect himself. After Caesar's death, Antony guarantees his safety by instructing his servant to go to the conspirators and say, "If Brutus will vouchsafe that Antony/ May safely come to him and be resolved..."(III,i,130). While plotting with Octavius, he tells him, "And let us presently go to sit in council How covert matters may be best disclosed, And open perils surest answered"(IV, ii, 45). Because of all these percautions Antony is the only main character that actually lives.
An actor playing Antony would make sure that he looks like he knows more than he's letting on. He would be cautious without stepping out of his carefree mask, at least in the beginning. After Caesar's death, Antony would have a strong sense of purpose and confidence.
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