About the part where you have to run over the slippery bridge with the gate,

I reccomend that there should be said that the less weight you carry, the higher the chances are to not fall off the bridge.

 

i.e. i was carrying my rune armor and BGS + other items, my weight was 32kg..

 

i kept falling and not being able to get to the other side

 

after i put off my rune armor, i weighed 12 kg..

i succeeded right away.

 

maybe that helps other players

 

Cheers,

 

Jeff

It may also be that running on the bridge makes you slip, but walking makes it easier to cross.