There's treasure in this tree so you take out your weapon and kill it.
After the kill though, you didn't feel so good, and you had to sats (さつ) down. Woah, I mean sat... sats? Uh oh. Something is happening to you. You sats down but your brain is all funny and you can't get up again.
Currently there are no similar looking kanji which exist in the WaniKani learning system