We had the pre-generated Starter Kit characters fight the Troll from the starter kit. The Adventure Book recommends to avoid this combat since it is so deadly, but I wanted to have the party experience a very deadly encounter before we start playing Enemy in the Shadows campaign.
I had Rudi, the old Watchman of Ubersreik yell at the Troll to intimidate. This then required a cool check, and given the Troll WP of 20, it easily failed that roll. So he was scared and ran back into the water. This gives the party the opportunity to go back the City Watchmen and form a large posse to take down the Troll in the river...
I was thinking mechanically, the Troll would then have a number of additional Cool rolls and once he overcame his fear, he would've come lurking back to see if the party was still around... Need to research this more.
Rules regarding the Die Hard trait:
http://lawhammer.blogspot.com/
FAQ
https://docs.google.