Metabolism,
the sum of the physical and chemical processes .... by which energy is made
available.
The pull was metabolic, although it could be
RO-M or M depending on if the vet treated or you requested treatment being safe.
Chokes can be minor and resolve with no treatment in which case you could
continue on. But RO is for rider option, healthy, fit to continue horse
with the rider having some issue. If the rider thinks his horse is metabolically
stressed and pulls even though the horse meets criteria, it is a RO-M. If the
rider feels a roughness and pulls then it should be RO-L. At least
that is my opinion.