I hear him coming. Let’s withdraw, my lord.
[III, i, 55]
This is the same phrase the Queen uses to Polonius in her closet.
Withdraw; I hear him coming.
[III, iv, 7]
The stage direction specifies “Exeunt” for the King and Polonius. In both scenes the observers or observer are to be behind an arras, in both scenes they withdraw at the sound of the unsuspecting Hamlet. The location of the arras behind which the King and Polonius hide is indicated in the First Quarto. Instead of the lines already quoted, which appear in the Folio and the Second Quarto:
At such a time I’ll loose my daughter to him,
Be you and I behind an arras then.
the First Quarto reads:
There let Ofelia walke untill hee comes: