How do the conspirators react to the assassination?

Cinna immediately starts crying out, "Liberty! Freedom! Tyranny is dead!" (3.1.78) The other senators all run out of the Senate House in confusion while the conspirators stay together to protect themselves. Brutus finally tells them to,

"Stoop, Romans, stoop.

And let us bathe our hands in Caesar's blood

Up to the elbows, and besmear our swords;

Then walk we forth even to the marketplace,

And, waving our red weapons o'er our heads,

Let's all cry out 'peace, freedom, and liberty!'" (3.1.106-111).

Add to the above,

Antony arrives and laments the death of Caesar, begging the murderers, specifically Brutus, to explain why Caesar had to be killed. Brutus tells him that Caesar was destroying the republic and had to be removed from power. Antony pretends to be convinced by this and asks the conspirators to, "Let each man render me his bloody hand" (3.1.185).