Burning darkness 180 k.o. RotomV 190hp

Mint_T_0ne's Charizard ex used Burning Darkness on Neddy3004’s Rotom V for 180 damage.
Neddy3004's Rotom V was Knocked Out!

RotomV has 190 hp and it even says in the battle log did 180 dammage. That was the first and only k.o. for the match. How could this be?

Setup
Mint_T_0ne chose tails for the opening coin flip.
Mint_T_0ne won the coin toss.
Mint_T_0ne decided to go second.
Mint_T_0ne drew 7 cards for the opening hand.

• 7 drawn cards.
  • Charizard, Mesagoza, Bill's Transfer, Colress's Experiment, Charmander, Charmander, Charmeleon
  Neddy3004 drew 7 cards for the opening hand.
• 7 drawn cards.
  Mint_T_0ne played Charmander to the Active Spot.
  Mint_T_0ne played Charmander to the Bench.
  Neddy3004 played Rotom V to the Active Spot.

Turn # 1 - Neddy3004's Turn
Neddy3004 drew a card.
Neddy3004 played Path to the Peak to the Stadium spot.
Neddy3004 ended their turn.

Turn # 1 - Mint_T_0ne's Turn
Mint_T_0ne drew Basic Fire Energy.
Mint_T_0ne played Bill's Transfer.

• Mint_T_0ne drew 3 cards.
  • Charizard ex, Charcadet, Charizard
• Mint_T_0ne shuffled their deck.
  Mint_T_0ne played Charcadet to the Bench.
  Mint_T_0ne played Mesagoza to the Stadium spot.
• Neddy3004 discarded Path to the Peak.
  Mint_T_0ne played Mesagoza.
• Mint_T_0ne flipped a coin and it landed on heads.
• Mint_T_0ne drew Armarouge ex.
• Mint_T_0ne shuffled their deck.
  Mint_T_0ne attached Basic Fire Energy to Charmander in the Active Spot.
  Mint_T_0ne's Charmander used Tail on Fire on Neddy3004’s Rotom V for 10 damage.
• Mint_T_0ne attached Basic Fire Energy to Charmander in the Active Spot.
• Mint_T_0ne shuffled their deck.

Turn # 2 - Neddy3004's Turn
Neddy3004 drew a card.
Neddy3004's Rotom V used Instant Charge.

• Neddy3004 drew 3 cards.

Turn # 2 - Mint_T_0ne's Turn
Mint_T_0ne drew Rare Candy.
Mint_T_0ne played Rare Candy.

• Mint_T_0ne evolved Charmander to Charizard ex in the Active Spot.
  Mint_T_0ne's Charizard ex used Infernal Reign.
• Mint_T_0ne attached Basic Fire Energy to Charcadet on the Bench.
• Mint_T_0ne attached Basic Fire Energy to Charcadet on the Bench.
• Mint_T_0ne attached Basic Fire Energy to Charcadet on the Bench.
  Mint_T_0ne evolved Charcadet to Armarouge ex on the Bench.
  Mint_T_0ne evolved Charmander to Charmeleon on the Bench.
  Mint_T_0ne played Colress's Experiment.
• Mint_T_0ne drew 3 cards.
  • Rigid Band, Basic Fire Energy, Charcadet
• Mint_T_0ne moved Mint_T_0ne's 2 cards to the Lost Zone.
  • Boss's Orders, Charcadet
  Mint_T_0ne attached Rigid Band to Armarouge ex on the Bench.
  Mint_T_0ne played Charcadet to the Bench.
  Mint_T_0ne attached Basic Fire Energy to Armarouge ex on the Bench.
  Mint_T_0ne played Mesagoza.
• Mint_T_0ne flipped a coin and it landed on heads.
• Mint_T_0ne drew Armarouge ex.
• Mint_T_0ne shuffled their deck.
  Mint_T_0ne's Charizard ex used Burning Darkness on Neddy3004’s Rotom V for 180 damage.
  Neddy3004's Rotom V was Knocked Out!
  Mint_T_0ne took 2 Prize cards.
  Basic Fire Energy was added to Mint_T_0ne's hand.
  Charmeleon was added to Mint_T_0ne's hand.
  No Benched Pokémon for backup. Mint_T_0ne wins.