It all has to do with the /loc you're at when you start and finish the cast. That's why you can get off a spell even if you run around while actually casting it, as long as you finish it in the exact same spot you started. When in a corner, that's pretty easy because you're guaranteed to be in the same spot. You can start casting CH in a corner, frolick around like a French person for nine seconds, and then squeeze back into the corner just before the spell finishes. It'll always work, assuming you do it right. Anyone with a bit of smarts will just go and stand in that corner so you can't get back to the same loc to finish the cast, of course.
You could theoretically do it without a corner, but the odds of hitting the exact same loc by sheer aim are pretty much nil. You can occasionally get close enough that it allows a channeling check, but it's not consistent enough to be worth trying in any serious situation. You can also cast certain very fast spells like Yaulp while running at base speed, because the spell is so fast that you don't run far enough during its cast to guarantee failure. It just gives you a really difficult channeling check instead.
What you can easily do to counter melee pushback is take a tap-step towards the attacker. With a bit of practice and attentiveness, you can usually negate most of the push and get an easier channeling check.
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