Or did you flex the frame? More leverage there...

You might want to check your derailleur alignment and a very detailed inspection of your chain as well, or simply replace the chain.

I had two situations - one a new bike I was popping the chain and blowing my top. I took it back to the store x 2, second try I was like DUDES, fix it or take it back. They finally figured out the chain link was bad causing the connection to distort under load. But it took some good torque (I would not use the units watts) to do that. They could not replicate which was the issue :) Good on them I didn't know why either.

Next is a bent derailleur. My wife was complaining of chain issues on her bike. I tried to adjust and it was hopeless. I then eyeballed the hanger and saw the alignment was out (bent) bent it back by hand, lined it up and all was good/smooth again.

I supposed you can get mistracking as a result of the BB, or the cassette as well. A good mech might be able to ID the issue.

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That isn’t a lot of wattage to make a chain drop through flex (no offense). Something was off there but I doubt it was rings or cranks doing it

Thanks for the suggestions, but an FD problem doesn't make much sense since I wasn't shifting. I suppose I could have flexed the frame but I have the carbon version of the Roubaix and that frame is pretty beefy. If I truly flexed the bottom bracket then that would explain everything else.

As for 1125 not being a lot of watts, I agree, but watts is not what flexes drive train components - it's torque - and considering the crank was stopped and then the chain dropped when I stood and mashed the right pedal, there was a lot of torque applied to that system at that moment. I weigh about 180 lbs right now, so I have a lot of "ass" to put behind a pedal stroke.

I was really wondering if the C1 chain rings or the Praxis crank were known to be flexi. I did several searches and couldn't find anything, probably because Praxis is much bigger in the Mountain Bike world than the road world, and C1 chain rings do not seem to be the PM of choice for Crit racers.

The bike is in the shop to be looked at and then I'm racing again this coming weekend. I'll see what happens.

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Is it possible for a mortal to flex either the crank or the chain rings enough to drop a chain

No. Something else is going on. either a misaligned FD, something loose, seized freehub, something broken....

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I'd be looking for any marks & knicks on the chain rings, essentially the chainrings are made to chuck the chain, but only with a bit of help from the deralier, I had a hell of a time getting a tandem to keep the sync chain on when I was using normal 38t chainrings, eventually binned them and swapped to a pair of track chain rings ( no ramps for the deraliur and loger teeth ) and cured it. with the tandem t started off ok, bit got worse and worse, and im prettu sure this is due to nick and burrs ithe chainrings picked up from chucking the chain.

Also what gear were you in? if you were cross chaining the ass off it, it could have derailed to theinner ring and the front mech chucked it right over the top, in shich case the front mech might need a tweek.