Which on are you going with?
The one where I reach safety first. 
The first one looks like the best to go with, the second one no way, the last looks like fun, but who would think of fun in a situation like that? 
If theres a problem that bad in a hi rise building... you gonna die...
1 window washer... who deploys it??
2 base jumping is inherantly dangerous
3 2 tons... so thats 10 people holding on??...not so impossable.. and a sure kiss of the sidewalk for all 11...
if your worried... dont work in a hi rise building...
ZemRrushe
Interesting. Thanks Z3.