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In the rain, you can use a little more rear brake, as the total braking force is less, therefore you transfer less weight to the front. Having said that, it's easier to lock a wheel if the brakes are applied too quickly and most riders have an easier time gauging the amount of braking when the front brake is used, as they typically estimate the mount of braking by sensing the amount of dive in the front. There a fewer obvious clues to modulating the rear brake. Not to mention most peoples' hands are more sensitive than their feet.
A locked rear brake is not going to necessarily put the bike down. Most instructors will teach you to keep it locked until you stop, in which case you can ride the thing a considerable distance that way. Locking the front brake will sually put you down pretty quickly, especially if you are leaned at all, or have a little steering applied. It's possible he locked the rear first and then panicked a little and perhaps grabbed a little too much front brake. Or, if he had the front brakes on too, he might have lost the front when he tried to steer into the slide caused by locking the rear brake.
I'd suggest that he take both MSF courses, if he hasn't done so already. If he's taken them and it's been a while, have him take them again. That's the kind of stuff they teach.
JR
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