I was doing a solo T3 run.
I got past the 2nd part of the arena, and I had two choices :
1. Do the 3rd part of the arena
2. Go down the elevator into another arena
I was unsure if I could do the 3rd part solo, so I thought it wold be best for me to go down into the other arena.
But right when I got on the elevator and before I clicked to go down, it changed into a Candlestick Keep.
That just sucked.
There was no way I was trying a Candlestick Keep solo, and I couldn't get off the elevator.
So I went back up :/

My suggestion :
Don't let the levels change after you get on the elevator.
I just feel it would be nice.

Alright.
Discuss.
Flame.
Whatever.

EDIT : apparently I could have still gotten into the arena.
Still, it would be nice if the level indicator didn't change.