They had a glimpse of a monstrous green form moving out through the open door.
Running to the hall, he caught a fleeting glimpse of a black form at the head of the stairway.
He caught a momentary glimpse of a stocky form.
When he bent down to lace his shoes she saw something, a brief glimpse of a dark form moving past the window.
He had just a glimpse of a brown form disappearing over the tops of some tall bushes.
He had gone but a little way in the Green Forest when he caught a glimpse of a blue form stealing away through the trees.
A glimmer, glimpse of a form, of a man or a god she could not say.
Then I got a glimpse of a slack form lying over the hood.
He caught only a fleeting glimpse of a form that was swinging out through the window.
Where the ambassador sat, Rudgutter caught glimpses of a monstrous form.