These humans really aren't trained for fighting, are they?

(Tora's idea of humans trained for fighting is slanted towards the kind of adventurers for whom it would be remotely a good idea to challenge her. This man wouldn't have qualified even back when she was just an ordinary tiger.)

It's sad how humans must send a hundred to fight and die fruitlessly for one of them to be lucky enough to survive and grow stronger. She'd rather fight just their champions if that could decide a war. But she'll still kill them, when they come to make war on a forest.

She avoids the thrown spear by just enough that it doesn't penetrate her skin. And then she jumps on top of the man in his cart, and she makes him die as quickly and painlessly as she can.

Well, they're not trained for fighting tigers by surprise... but that amounts to the same thing at the moment.

Aria sets free the oxen and breaks the carts and worries.

Killing three hundred men is easy, in a sense, if they all attack her and are not individually particularly strong (and don't even have bows, although bows won't be nearly as useful come nightfall); only a matter of time and careful work. But it would not be be nearly as easy to track them all down if they scatter and flee in all directions. Killing all of them like she intended calls for more planning, preparing the right spells, setting traps, calling on allies.

If she wants to make sure no word makes it back to Isengard - and that includes killing any scouts or reinforcements Isengard sends out, once they notice the logging party hasn't come back on schedule - it may take several days, and a lot of care. But after several days, nobody coming back becomes its own kind of news. Once Saruman is aware that something is wrong, he might scry her - or, at least, he might scry his people, and this place, and then see her or Tora. And then she would lose the crucial element of surprise, in case she decides attacking Orthanc itself is feasible.

What are her actual goals here?

Saruman can learn that tigers are killing his people; he will probably take a few days to muster a response. He would not be afraid of tigers attacking Isengard. What he must not learn is that one of the tigers is a druid, or any kind of mage. And he shouldn't see Aria even as a tiger, to prevent him from scrying her later.

The logging of the forest must stop immediately.

Some of the loggers may escape, which is unfortunate, but there are probably many who took part and are not here today, and she wasn't going to hunt them all down. The important part is to break their organization, take out their leaders, and make sure they never dare to come back.

Scouting Isengard tomorrow morning is more urgent than spending another day or two killing everyone here, as long as they are fleeing.

She will kill as many as she can tonight, while Saruman (hopefully) isn't scrying this place yet, and not use any flashy magic that would make it clear they are more than just tigers, and then she will leave the rest to Tora and fly out to scout Orthanc.

(Aria has not reexamined her assumption that "a pair of tigers, much stronger than most, attacked us from the forest" is an ordinary kind of thing to happen to loggers, and shouldn't make anyone suspicious as long as she's not striking people with lightning bolts.)

She turns back into a tiger and tells Tora the slightly-new plan. And then they are going to walk towards the logging-camp, slightly around it, not trying to particularly hide; their goal here is to frighten the loggers and make them stop what they're doing.

They'll start with the humans actually cutting down trees, if they can make it that far without a war-party cutting them off. They can run faster than most humans or orcs, but she's not going to spend an extra hour running around unless the war-party looks scary enough that she doesn't want to fight them.

They'll kill any stragglers they can catch on the way, but they're moving with a purpose.