Your story is confusing. How does it quickly overheat when you say it only got to 210*?

Clearly you lost coolant, the question is where. Did you UIM finally crack internally, did you coolant elbow let go, did your hoses leak or pop?

The extent of the damage is dependent on how far you pushed it overheating it. Steam coming out is a clear sign that it got very hot. You may not have noticed if there wasn't enough coolant in the LIM to show on the temp gauge.

Fill it up and see how bad it is.