actually, Flare won against Lucy by sneaking her hair under the floor and threatening Wendy. Lucy had no choice (other than yell at Wendy to look out or even let them do something. they can't do anything to Wendy otherwise they'd get immediatly disqualified) but to not attack and let Flare ragdoll her around.
Yes, but that wasn't the main reason why she lost. Besides, Natsu was able to stop the situation and it was that damn imp that canceled out her Urano Metria spell which lead to her being unable to continue the fight.
Will Demon Slayer meets Slugterra? Besides, if the Demons first encountered Ghouls and Darkbanes, while the Demon Slayers first encountered Slugs and the Shane Gang, it's slightly like they're related to the term "Common Ally vs Common Enemy"
Eh, i thought that diablo will fight jura but i just remembered that it's follow like canon so....yeah, and thank God that Rimuru set that barrier..my favorite girl, Lucy don't deserve lost in that match