Rules of nature

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I was trying to get some sleep when I heard a crane fly hitting the walls of my room like crazy. I turned on the lights, got a closer look, and it had something clinging onto its legs. It looked like a spider trying to eat its prey.

At this point, I was surprised, scared, and annoyed, since I wanted to sleep.
I spent a few minutes considering what would be the right thing to do, trying to extrapolate the situation to two kids fighting to dead over the last piece of food.

>I could leave them alone, to kill each other. I would become a passive murderer, doing nothing even knowing the crane fly was suffering. Also, the noise wouldn't stop, so I could not sleep.

>I could kill the spider. Sounds like killing the bad guy, but the spider was just trying to eat to survive, just like the crane fly was. The same applies to separating them.

>I could kill them both. That would end my suffering, but it would be a selfish move, leaving them both dead, making their fight meaningless, and with no winners to enjoy victory, just loosers.

>I could kill the crane fly. Ending its inevitable suffering, making it easier for the spider to eat, and ending the noise.

I decided to take the last option, and killed the crane fly when it stopped for a moment.
But then, I realized it was not a spider on its legs, but just a spiderweb.
I was wrong, so I had ended its life for no reason.

That got me thinking about it even more.
What would you have done?