But doesn't sealing first shut off an even bigger source of impurities for the parasite to feed on than the fragments of slowly dissolving impurities that we ripped into the liminal? The parasite will be substantially weaker after the sealing so why would it be harder to take care of then than it would be now? Also I think chance of capturing the parasite is alot higher after we have sealed it in than trying to hunt it down now so I think it is for a meaningful reward.
It would be harder to take care of after sealing because if it decides to focus completely on hiding, we have no way of finding it. We've only detected the parasite, intermittently, when actively engaged in fighting. And only saw it directly when we jumped directly into the liminal. We didn't even spot it the
second time we entered the liminal! It's currently off-balance and reacting to some hurt, which gives us a small window of predictability to actually track it down. If we pursue the infection at the breach, where it's densest and most secure, and show that we can hurt it
there too, that's exactly when it's most likely to continue learning and react in new ways, like giving up on fighting back and hunkering down in some corner we won't find it. And that's a problem.
Unless we actively, deliberately focus on the parasite, we can and will not catch it. We know this from the capabilities it's shown so far.
More troubling, unless we actually catch the parasite, we
cannot know its status. We won't know where it is, or what it's doing. Maybe it flees through the breach, maybe it doesn't, but that isn't knowledge we'll have.
The problem with choosing to seal first is it means we literally will not know if our mission was a success. The primary reason Ling Qi embarked on this venture was to have some peace of mind in a more secure fief while she leaves to the capital for close to 2 months, and then later to the warfront for who knows how long. Leaving a hostile, intelligent, body-jacking liminal parasite of impurity in an ambiguous state is incompatible with Ling Qi's motivation. This is her Home we're talking about; why would she leave this to chance when she's not going to be around to monitor the situation?
For all we know, the parasite could pull a mirror version of the wait-and-target-vulnerabilities strategy we didn't use last time, survive on the impurity we threw into the liminal long enough to watch while the Piper lets its guard down and starts letting its denizens out of its panic room, and ultimately finds its way into the Piper's Lake node. Once in there, its nature would let it subvert the nature of the node into preventing the Piper, or us or any other casual higher realm observers, from even noticing it was infected.
Do I think that's particularly likely? No, that's a fringe possibility. But the problem is that unless we confirm things, unless we "see the body", we won't actually know where the heck the parasite ran off to. It won't be a possibility we could actually rule out. The parasite is genuinely the only true danger in the scenario, because it's sneaky and smart and subversive, and it's wild to me that people don't want to put it down decisively, when we
know it's sneaky and smart and it could escape in any direction without us being able to contain or even necessarily see it unless we dedicate our full attention to it. Doesn't make sense tactically, strategically, or -most importantly- to Ling Qi's sensibilities of neutralizing dangers in her backyard.
And lastly, just from a Doylist perspective, our chance of capturing the thing is definitely higher if we pick the choice where we try to deal with it, because otherwise there'd be no reason for the "try to deal with it" choice to exist.
The worst option is that it either escapes and returns later, or it leads us on a long enough chase that it recovers it's strength while bringing us up against our time limit. There is no fallback option here.
Sealing it of first, the worst that could happen is it rushes us immediately to try and escape: this is the outcome that we would consider the best if we took the hunt option. The best is that it tries to hide and dies of starvation and exhaustion to the piper without any more fighting.
We don't really have a time limit anymore. Not like we did before. With the Water node cleansed and re-empowered, the passive impurity is being handled by the Piper in every region other than the final conflict zone. Which we won't be mucking around in until we actually push for the breach.
Our choices so far have given us breathing room more than anything else. It's the last thing in our list of concerns, atm.