Quote 1
CORNWALL
I have received a hurt. Follow me, lady.—
Turn out that eyeless villain. Throw this slave
Upon the dunghill.—Regan, I bleed apace.
Untimely comes this hurt. (3.7.116-119)
Contrary to what he says, Cornwall's wound is very "timely"; the servant has served up justice for Gloucester's eyes.
Quote 2
CORNWALL
See 't shalt thou never.—Fellows, hold the chair.—
Upon these eyes of thine I'll set my foot.
GLOUCESTER
He that will think to live till he be old,
Give me some help!
As Servants hold the chair, Cornwall forces out
one of Gloucester’s eyes.
O cruel! O you gods!
REGAN
One side will mock another. Th' other too. (3.7.81-86)
Cornwall blinds Gloucester for being a "traitor" (that is, loyal to King Lear). Is Gloucester under any obligation to serve Cornwall?