Playing kaya against nahiri on my turn four I attacked, completed my second bounty, then after combat nahiri's victory animation played and I lost the match.

T1 OP: No play
T1 ME: 2x Lingering Spirit
T2 OP: Kor recruit attack, no blocks
T2 ME: Devoted steed buff a spirit attack, bounty gave stalwart spirit
T3 OP: Kor recruit, stoneforged blade on recruit, attack, I block the buffed recruit with 1/1 spirit
T3 ME: ghost blades, 2/2 spirit steals 1 power from Armored 2/1 recruit, faithful steed buffs spirit to 3/3, attack, opponent blocks devoted steed with 4/1 recruit
T4 OP: skyknight Legionnaire, stoneforge blade on skyknight, attack with skyknight, no blocks
T4 ME: Stalwart spirit stunning skyknight, ghostblades steals 1 power from 1/1 recruit to 3/3 spirit, attack with spirit and faithful steed, no blocks, bounty gives second stalwart spirit, then defeat message appears and I lost the match.