You are correct. It is incorrect. It's the same problem as in the first question -- the dreaded comma splice. The quote marks don't change the grammar; a stronger stop is needed. A period would do.
1. "I see a light at the end of the tunnel," Russial said. "It's probably a mirror."
The following would be OK too:
2. "I see a light at the end of the tunnel; it's probably a mirror," Russial said.
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