GR translation: alone in his tar circle, his chalk terror

[Mike Jing]

V756.3-9, P771.5-11   “Relax,” the Manager’s eyes characteristically
aglitter. “There’ll be a nice secure home for them all, down in Orange
County. Right next to Disneyland,” pausing then exactly like a nightclub
comic, alone in his tar circle, his chalk terror.
       Laughter surrounds you. Full, faithful-audience laughter, coming
from the four points of the padded interior. You realize, with a vague
sense of dismay, that this is some kind of a stereo rig here, . . .

What do "tar circle" and "chalk terror" refer to here?
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