Fred Little wrote:
But if there are multiple lines of attack, or walls, or surface drops that can intervene, there may be case-by-case reasons for nage to move while uke does not.
In the case of multiple attacks, nage has to move, to chose next attacker. But he has max 1 second to throw each attacker, so both, uke and nage must move. And in fact, nage goes by very linear movement, so going around of uke is out of question.
Of course the wall will stop definitely an attacker, when you throw him with great power