Tropes

All Up to You: While Xena is still present in the sequence, it's Gabrielle who comes up with the plan to put out the fire.
Booze Flamethrower: Evil Xena does this in order to disperse a mob. Unfortunately, the flames spread quickly, killing 40,000 people in the resulting inferno. It is the last time that she does this trick on the show.
Breath Weapon: Yodoshi uses the ice variety to freeze a poor victim solid.
Grand Finale: The first part of the story.
Honey Trap: Yodoshi forced Akemi into this position, luring unsuspecting travelers into her house for the demon to kill and eat their souls.
Katanas Are Just Better: When past Xena clashed swords with the blacksmith, her sword is cut in half in one blow. Xena was more impressed with the craftsmanship than anything.

Pressure Point: Gabrielle found out that Xena taught Akemi "the Pinch" far earlier than she did to Gabrielle. She later shows Gabrielle how to do it.
Retcon: The fact that Gabrielle learned how to use the Pinch in a previous episode is ignored, as Xena teaches it again to her here.
Seppuku: After killing her father, Akemi does this outside the house, with Xena assisting with a decapitation.
Soul Eating: Yodoshi's preferred method to take souls.
Took a Level in Badass: Gabrielle throughout the episode, from learning how to perform The Pinch to performing the superflip on her own for the first time.

Weapons Breaking Weapons: Xena's sword gets sliced in half by a katana, prompting her to acquire one of her own.
Youkai: Yodoshi is referred to as a 'demon', but he does look the part in being a youkai.
Your Soul Is Mine!: Yodoshi seized on the opportunity from Xena's blunder by stealling the 40,000 souls for himself. He continued to do so for countless other souls up to that point.

Disclaimer: Xena and Gabrielle's Flying Circus & Amateur Fire Brigade will be arriving in your town soon.

Recap / Xena S 06 E 21 A Friend In Need Part 1