Just want to double check on this. The knockback sequence comes after the damage sequence so I assume that when I hit a character and I have KNOCKBACK I get to wait until they have clicked damage before deciding whether to knock them back. Is that right?

I know that knockback prevention from charge etc. is determined at the start of the attack, I'm just wondering when exactly I make the knockback choice. Thanks.

Not True.

Depends on the KNOCKBACK.

KNOCK BACK PREVENTION
Some effects prevent a character from being knocked back. For the first type of knock back (during an attack), check for these effects at the end of step 3 in an attack (before damage is dealt). For the second type of knock back, check for these effects just before knocking back the character. Effects that prevent a character from being placed also prevent a character from being knocked back.

Velcade, you are right, what I said wasn't correct. What I was trying to say was that if you damage them and they lose charge, they still can't be knocked back. What I said was sloppy -- there might be instances where this distinction (step 3 rather than step 1) matters, so I should have gotten that right. Being wrong about the second type doesn't matter as much in this case, since that doesn't involve an attack at all, and I was talking about the first type of knock back.

But when do I decide whether or not to knock back if we are dealing with the first type of knock back?

You would decide before the step 6 in the attack sequence and after step 5

That works for me. I figured it probably happened at the end of step 5 since KNOCKBACK specifies "When one or more opposing characters takes damage from this character's attack, you may choose..." Damage Clicked also says "When a character takes damage, you keep turning the dial until..." I figured that since damage clicked and knock back choice have the same timing (when a character takes damage) that I, as the active player, could choose the order. I don't know why I would ever choose to trigger knock back before seeing what their click looks like after taking damage, but you never know.

After step 5 of the attack sequence is a fine answer by me too, since what matters most to me is that I get to wait until they have clicked damage before deciding.