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I can't get the NPC's 2 rappel down, it says NO ACT SEQUENCE FOR ACT_RAPPEL_LOOP, all i want is them to rappel and fight and kickass, also i can't get the helicopter to do anything either, i'm lost using the Scripted Sequence thing, i'm getting a freakin' headache because of this crap, someone please help me!

There are a number of tutorials on the web but one I can recommend is from 3dbuzz.com

Head over to the site and check out the downloads section. There is a series of video tutorials for level design in HL2. One of them covers getting the combine soldiers to rappel down the line, and then getting the helicopter to fly off.

Definitely worth checking out, but you will probably have to register at the site to be able to download.

Incidently, don't forget that foyleman is busy putting another book together about HL2 mods and level editing.

I wrote a tutorial on this a while back, http://www.modsonline.com/Tutorials-read-291.html