Marty was spot on. I went through the ACA courses years ago for river rescue. It's a great skill to have. Just like firearm safety and use, if it's not automatic it ain't gonna help you any to have it. I helped some guys out on the Yak last year. Training kicked right in. Got them and thier boat out of a sweeper in no time with just injury to thier pride. I should go in for a refresher. And the comment on the lucky part. GOD, I know guys like that. Know guys who have had alot of close calls. How they make it through is just amazing sometimes (and no, they don't do it on purpose too, boggles me they make it through sometimes).
You did good at least going with someone who rows. I don't know him, but if he has the experience, that'll help. I've taught hundreds to row over the years. I started quite young with my Dad teaching me. Having had about every vessel over the years (quite literally every style of rowing vessel), I've done my time on the sticks. Thankfully, I was rowing whitewater boats in class 4's by time I was 15 confidentally. Hell, was rowing a pram down the Kalama at 7. LOL.
Just a reminder though. Just because you've taken a class, still start easy. I know too many who've taken whitewater floats with a guide who thought they could go run heavy whitewater. Start simple, or stick with what you're floating now. Then, move up a class once you're comfortable and have someone more experienced with you to float with (not necessarily in the boat with you, but in another boat to follow thier lead).