Don't move. Watch carefully. Maybe some better senses are in order.
+1
If these are humans aggravating the human race = doom
Attempt to gain some measure of clearness, and use the light going thru us to see.
While the animals would undoubtedly be a good meal, you decide safe is better than sorry. Considering their general oddness, it would be much better to watch and wait. Who knows? You might even learn something.
While further developing your senses would have been nice, that plan is immediately squelched by your total lack of vitality. Mutilating your new tree has been hungry work, and, as useful as parasitism is, it won't be quick in replenishing your stores.
Of course, while your vibration-sense may be imprecise, it is by no means useless. While you can't see the creatures with any real clarity, you
do have an idea as to what they're doing.
That is, you would have an idea of what they’re doing if any of their behavior made sense, Taking into account your (admittedly brief) experience of natural selection, you know no creature with the desire to live would even
think of acting as they do. Yet, they seem to be perfectly safe and sound- even, you dare to say, healthy.
It is only now, as they are about to walk away, that you get some hint as to their true nature. One of them abruptly stops- and turns around to face you. That’s when it happens- the animal makes a louder, sharper noise, and the other one follows its gaze.
The knowledge strikes you suddenly: these creatures think. They are intelligent enough to notice that you are here, and to register that you are something new. They will wait out there in places you have no way to see, and someday, when you are larger and stronger and more hungry than you are now, they will take notice.
Maybe, on that day, they will kill you. But maybe, just maybe, you will taste their blood.
________________________
It is about an hour since the creatures left, and the vitality from your tapped trees has built into a small reserve. The encounter with other beings has given you much to think about- and reason to worry, as well. While you have yet to consider a plan of action, it may very well be wise to keep them in your thoughts.
Currently, the corruption is a mass of various crystals and goo. It encroaches two trees, which have both been tapped for energy.
Fully spread, it would expand roughly five feet in every direction. It has a small store of energy, and is slightly hungry.
The Corruption has a small puncture wound.
It is in forest of moderate size.