LOX/Methane rocket engine hard start slow motion

600fps, i.e. 1/20th speed video of a lox/methane engine hard starting. The purge is on, then the igniter fires. The engine is burning, the igniter goes out, and then a stream of mixed lox/methane comes out of the engine. The stream is lit by the remaining fire outside the engine, and re-lights the engine. It briefly reached 6000lbf, on a roughly 2000lbf engine. It then shuts down quickly. The engine was fine, and was run normally afterward.