I have readed a blog http://handballdream.blogspot.com/ and it have a list of handball hells.
Leon is one of them,so normal that Kiel lost there.
Handball Hells
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Well, there is only one hell and that is Flensburg. Kiel lost there 16 times.

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Flensburg halle is amazing like Thw Kiel or Vfl Gummersbach, but i don´t think it´s a hell, because the ambient there is really good, really polite, instead of that hostile ambient, but the ambient of celje, veszprem and leon is really nice when i was there, but with a lot of pression to the visitants players :D.
I love the ambient from Flensburg, really nice people!