"When Cæsar's head is off.—Yet I do fear him."
Sc. 2.
"Fierce fiery warriors did fight upon the clouds."
"Horses do neigh, and dying men did groan."
The context demands the past tense here also. The 2nd folio properly therefore read did for 'do.' See on Mer. of Ven. ii. 3.
"We were two lions, litter'd in one day."