Othello Why how now ho from whence ariseth this... - WAEC Literature 2018 Question

Othello:    Why, how now, ho? from whence ariseth this?
            Are we turned Turks, and to Ourselves do that
            Which heaven hath forbid the ottomites?
            For Christian shame put by this barbarous brawl!
            He hat stirs next to carve for his own rage
            Holds his soul light; he dies upon his motion.
            Silence the dreadful bell, it frights the isle
            From her propriety, What is the matter, masters?
            Honest Iago, that looks dead with grieving
            Speak, Who began this? On thy love, I charge thee

Iago:       I do not know

   (Acts II, Scene Three, Lines 155 - 165) 

The underlined expression refers to the____________