Cursed Summoning, part one

[Bulbatron]

I've enjoyed this level as well. The problems I had before were solely due to my own stupidity.

However, having

Spoiler below!

mixed the potion (as far as I can tell, I mixed the potion correctly) and re-entered the kitchen I get the scary piece of music and I look around as though something is about to happen, but then, instead of being pulled into and down the shaft, I am just sort of dragged towards it in slow motion and I don't actually mount the banister round the side. I just get stuck there, almost, but not quite, going over in down the shaft.

I even checked the previous poster's playthrough to see what was supposed to happen and make sure I hadn't just done it wrong, but as far as I can tell, I've got everything right.

However, just to remind you, I have enjoyed the level and I like the lengthy notes.