I threatened to oust them of class..
I said, "today is a strike & I have only come here taking the risk because your exam is on 6th, & unlike some of you, some deserves any help I can give them..So those of who have come here taking the risk to be out on a strike only to disrupt the peace of my class, can get out right now. Anyone??"They looked really scared..Then at the 2nd leg of class when they again spoke, I yelled at the top of my voice, "Shut up! I will throw each who even makes a titching sound & it will be their loss, cos I am not the one who'll be sitting on an exam a week later, & what I am covering right now has a really good chance to be on the question paper!"