Come, cousin, canst thou quake and change thy color

Richard
Come, cousin, canst thou quake and change thy color,
Murder thy breath in middle of a word,
And then again begin, and stop again,
As if thou were distraught and mad with terror?
Buckingham
Tut, I can counterfeit the deep tragedian,
Speak, and look back, and pry on every side,
Tremble and start at wagging of a straw,
Intending deep suspicion. Ghastly looks
Are at my service, like enforcèd smiles,
And both are ready, in their offices,
At any time to grace my stratagems.