How to defend from the button after the hijack opens: which hands 3-bet, which call, and which fold.
Hand by hand
Always 3-bet: AA, AKs, AQs, KK, QQ
Mixed (a die roll decides — low is passive, high aggressive): AJs (4/6 3-bet, 2/6 call); ATs (3/6 3-bet, 3/6 call); A9s (4/6 3-bet, 2/6 call); A8s (5/6 3-bet, 1/6 call); A7s (5/6 3-bet, 1/6 call); A6s (2/6 3-bet, 4/6 fold); A5s (5/6 3-bet, 1/6 call); A4s (4/6 3-bet, 2/6 call); A3s (4/6 3-bet, 2/6 call); AKo (5/6 3-bet, 1/6 call); KQs (4/6 3-bet, 2/6 call); KJs (5/6 3-bet, 1/6 call); KTs (4/6 3-bet, 2/6 call); K9s (5/6 3-bet, 1/6 call); AQo (4/6 3-bet, 2/6 call); KQo (4/6 3-bet, 2/6 call); QJs (4/6 3-bet, 2/6 call); QTs (4/6 3-bet, 2/6 call); AJo (3/6 3-bet, 1/6 call, 2/6 fold); KJo (1/6 call, 5/6 fold); JJ (4/6 3-bet, 2/6 call); JTs (3/6 3-bet, 3/6 call); J9s (2/6 3-bet, 1/6 call, 3/6 fold); TT (4/6 3-bet, 2/6 call); T9s (4/6 3-bet, 2/6 call); 99 (3/6 3-bet, 3/6 call); 98s (1/6 3-bet, 1/6 call, 4/6 fold); 88 (3/6 3-bet, 3/6 call); 87s (2/6 3-bet, 1/6 call, 3/6 fold); 77 (3/6 3-bet, 3/6 call); 76s (3/6 3-bet, 1/6 call, 2/6 fold); 66 (2/6 3-bet, 3/6 call, 1/6 fold); 65s (4/6 3-bet, 2/6 call); 55 (1/6 3-bet, 2/6 call, 3/6 fold); 54s (3/6 3-bet, 2/6 call, 1/6 fold); 44 (1/6 call, 5/6 fold); 33 (1/6 call, 5/6 fold); 22 (1/6 call, 5/6 fold)
Always fold: A2s, K8s, K7s, K6s, K5s, K4s, K3s, K2s, Q9s, Q8s, Q7s, Q6s, Q5s, Q4s, Q3s, Q2s, QJo, J8s, J7s, J6s, J5s, J4s, J3s, J2s, ATo, KTo, QTo, JTo, T8s, T7s, T6s, T5s, T4s, T3s, T2s, A9o, K9o, Q9o, J9o, T9o, 97s, 96s, 95s, 94s, 93s, 92s, A8o, K8o, Q8o, J8o, T8o, 98o, 86s, 85s, 84s, 83s, 82s, A7o, K7o, Q7o, J7o, T7o, 97o, 87o, 75s, 74s, 73s, 72s, A6o, K6o, Q6o, J6o, T6o, 96o, 86o, 76o, 64s, 63s, 62s, A5o, K5o, Q5o, J5o, T5o, 95o, 85o, 75o, 65o, 53s, 52s, A4o, K4o, Q4o, J4o, T4o, 94o, 84o, 74o, 64o, 54o, 43s, 42s, A3o, K3o, Q3o, J3o, T3o, 93o, 83o, 73o, 63o, 53o, 43o, 32s, A2o, K2o, Q2o, J2o, T2o, 92o, 82o, 72o, 62o, 52o, 42o, 32o