Read the excerpt from act 5, scene 2, of Julius Caesar. [Alarum. Enter BRUTUS and MESSALA]

BRUTUS. Ride, ride, Messala, ride, and give these bills
Unto the legions on the other side.

[Loud alarum]

Let them set on at once, for I perceive
But cold demeanour in Octavius’ wing,
And sudden push gives them the overthrow.
Ride, ride, Messala, let them all come down.

[Exeunt]

What does Shakespeare mean by the phrase "cold demeanour” as spoken by Brutus in this passage?

physical strength
unbroken resolve
heightened awareness
lack of enthusiasm