Hii I’m pretty sure it’s ‘Will not be’ sorry if it’s wrong
When comparing the man's legs to rubber in context, it sounds like he is unable to walk. Describing his legs as rubber would indicate they bent and bowed under his weight on them. He's probably either injured or lame.
In Act 4, Scene 1 of Shakespeare's "Macbeth," the first apparition tells Macbeth to beware of Macduff, but the second says he does not have to kill him if he has no reason to fear him. Nevertheless, Macbeth resolves to seize the town of Fife, raid Macduff's castle and murder him as well as his wife, children and everyone in line of succession. As a result, Macbeth expects that will help him conquer his fear and sleep easily at night.
Your answer would be "The king whereof is darkness" hope this helps!