Consistency

Repeat yourself.

"Yourself! Yourself!" you shout in vain.

But it's no good. He's still dying. You'll have to act fast if you're going to save Yourself!

Repeat yourself.

So, this doppelganger is mimicking your every move perfectly? Two can play at that game.

After he sticks his tongue out at you, you stick your tongue out at him. Then he sticks his tongue out at you. Then you stick your tongue out at him. Then he...

Okay, this isn't working, and your tongue is getting tired. Maybe another tactic is in order.

Repeat yourself.

Okay, you don't know why this giant clone of you decided to swallow you whole, but you're not going to let him digest you.

Fortunately, you know enough about anatomy to figure out where to kick in order to cause just enough discomfort. A few moments later, you repeat on yourself, and emerge messily from your stomach.

That was pretty unpleasant. Giant you is reeling from it, though. Looks like this is your chance to act!

Repeat yourself.

Oh god, how embarrassing. The other swamp monsters are still staring at you.

Quickly, you excuse yourself and leave the party. You find some more peat moss, and slather it on. Ah, that's better. Now you don't feel naked and vulnerable.

You're just about to head to the party when you hear a noise. You peer out of the nearby bushes and see some humans with hunting gear!

Oh great. Humans. Every week or so, a few of them show up trying to find you guys, and then they try to take you back to a lab or something stupid like that. Ugh, it's such a pain.

Well, everyone else is busy with the party. You may as well take care of these guys before you head back. What are you going to do?