Yet truly, they were very disturbed and terrified, supposing that they saw a spirit.
But they were terrified and affrighted, and supposed that they had seen a spirit.
But they were so startled and terrified that they thought they saw a spirit.
But they were terrified and affrighted, and supposed that they beheld a spirit.
They were terrified and afraid. They thought they were seeing a ghost.
But they being troubled and frightened, supposed that they saw a spirit.