Can it also be "I hear a dragon and I'm afraid.
No, because izūgagon is transitive. It has a non-transitive version: zūgagon. So your sentence would be "Zaldrīzī rȳban se zūgan."
Helped out a lot !!!!
What about "I hear dragons, and fear them"?
That would be "Zaldrīzes rȳban, se pōnte izūgan."