The High Aldwin
Well, without knowing precisely what is happening, do they have to "hunt" the orcs or just drive them away, etc.? In other words, does "killing" have to be the only solution?No. The Orcs are hunting game, the PCs are more or less hunting Orc as part of dealing with a bigger threat.
There might be more orcs, but they only see the one.A single Orc, yes. They travel in groups, though, as adventurers aren't the only dange rin the woods.
If the ultimate goal is to take out the boss behind the orcs, perhaps the orcs can be allies in taking out the boss, depending on their relationship to it (are the servants, slaves, allies, etc.?).Given that the PCs' mission is, in part, to take out the Orcs (ultimately it's to take out the boss behind them, but the Orcs are in the way), that would be a very unexpected outcome.
Think of it this way: if you go back to the old D&D cartoons from the 80's, when did the party ever have to kill something to get on to the next part of the adventure or finish it? Not often, IIRC.
There's nothing wrong with it, if your group enjoys that theme, but I am simply addressing the points outlined in the video in the OP.