Based on everything, I question if the water pump locked up and the noise you heard was the timing belt coming apart when it started. The pump is run by the timing belt. Take a look at pic 1.
When you engage the starter to start the engine, does it sound normal? Is it possible for you to record the engine cranking so I can hear it? I can usually tell if it is a timing related issue by sound.
If not, the first thing I would do is remove the timing cover and see if there has been damage to the belt.
Let me know.
Wednesday, March 25th, 2020 AT 11:10 PM