I doubt it was the batteries although for future reference those XT connectors are on the small side. I would target the ESC or the motor as the likely cause. Usually the Castle motors are decent quality but if it has been run hard in the past and overheated there is a good chance you have a mild short in the windings. The ESC and motor might work fine with no load, but as soon as load is applied the short becomes more severe and causes excessively high phase currents in the ESC which leads to failure. Was there any moisture in the ESC case by chance? This is the usual culprit for sudden ESC failures. If they get wet from a prior run and are not dry enough it will cause a failure rather quickly.
Also check your motor and battery connections for cold flow solder joints. This is hard to find as shrink tubing will keep the connector and wire from pulling apart and also barely keeps the solder in, but the electrical connection is compromised.
Clean the motor with some alcohol to remove the burnt smoke from it.
Tyler Garrard
NAMBA 639/IMPBA 20525
T-Hydro @ 142.94mph former WR
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