I don't know why Kab (that's this troll's name, as written somewhere around page 4 or 5) let the cows out. Maybe they were noisy and annoyed him. Why not let this one out too? Maybe it's so badass it wouldn't leave its place to anyone!
Negotiating with a troll is harder than it seems!
The language barrier is a bit tricky too...
Indeed. Pekka has no way to know if he's doing what the troll expects before he sees a reaction, an has no idea how this reaction would be. The current state of his underwear is best left unimagined!