Here is an example of a play known as the obligatory finesse. Needless to say there is no one holding a gun to declarer's head and forcing him to take it. It simply is a play that can win for you and can't cost you a trick if you take it.
Study only the bidding, the lead and the North-South hands, (place your thumbs over the East-West hand). Then develop a plan of play and compare it with Mike's to see if you would have also earned an award.
Rule: When you as a defender have four of declarer’s trumps, you should lead your longest other (non-trump) suit in hopes that declarer is short in that suit.