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Scenario 2 - Wrong play 
If North plays the ♥2  on the first trick, Declarer's ♥Q will win the trick.  Next Declarer will lead his ♥4 and if North plays low again finesse in Dummy with the ♥J.  If North plays his ♥K instead, Dummy will catch it with the Ace then win another trick with the Jack. In this scenario NS will win not a single heart trick !
  
  
 
Scenario 2 - Right play : "Second player covers an Honour !"
  
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 | North ♥ .. 8 2 
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| 
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 |  ♥K  
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Declarer 
♥..  7 4  
 |  > ♥Q 
 |     
 |  ♥A
 |     Dummy     
♥  .. J 9 5 
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| 
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 |  ♥3  
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South ♥ 10 6 ..  
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North must  cover the Honour card lead (♥Q)  with his ♥K !  This will force Dummy to play and win with the ♥A. South's  ♥10 is now promoted to make the third heart trick. !   Next
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