If "saw" means "perceived visually":
* Behold: Implies a sense of wonder or amazement.
* Witness: Indicates being present and observing an event.
* Discern: Suggests recognizing something that is difficult to see or understand.
* Catch a glimpse of: More informal, suggesting a brief, fleeting view.
If "saw" means "used a saw to cut something":
* Severed: Emphasizes the forceful action of cutting something.
* Sawn: The past participle of "saw," often used in a passive sentence.
* Cut: A more general term for the action of using a saw.
If "saw" is a past tense verb meaning "did see":
* Beheld: More formal and literary, implies a sense of wonder or amazement.
* Witnessed: Indicates being present and observing an event.
The best choice depends on the specific nuance you want to convey.