Yes, are does sound like it went into reduced power. Should have been a message or light on the dash. Often a key cycle will restore it to full power (for some amount of time, until/if the problem reoccurs). As such, if it happens again, stop ASAP, turn it off, and start it back up. Forced idle is meant to do nothing more than that. Lets you pull over with power steering and brakes basically.
(And as you're already working on, should be a code stored....)