The Second Negative gives opener no hope for slam, and he might be passed out if he repeats his first suit.
Partner You
♠ Α Κ 10 9 6 2 ♠ 5 4
♥ A K Q ♥ 8 4
♦ 7 4 ❏ ♦ J 9 8 6 5
♣ K Q ♣ J 6 4 3
Partner You
2♣ 2♦
2♠ 3♣
3♠ Pass
When partner just repeated his suit, he indicates a minimum hand – pass is just right for you. What if partner was stronger?