From the novel; Julius Ceasar
‘And for Mark Antony, think not of him;
For he can do no more of caesar’s arm
When caesar’s head is off’.
This means that Mark Antony
- will be assassinated with Caesar
-
will become harmless once Caesar is dead
- is as powerless as Caesar's arm to control Caesar
- is as dangerous as Caesar's arm
- cannot do more harm as Caesar is capable of.