Panel one: a man wearing all camo sits in a bunker, holding a gun and darting his eyes around in a paranoid manner. The decoration is up to you, though it should give off a "paranoid conspiracy theorist" vibe.
Inset panel: the man is startled
Panel 2: we see the door of the bunker. It has a porthole that the man is in the process of removing the cover to, though he's not watching the porthole. His finger is on the button of the intercom set up next to the door.
Man: WHAT IN THE HELL DO YOU...
Panel 3: we see the head of an Ape warrior through the porthole, and we can see some of the open cavern the bunker is built into around him.
Inset panel: through the porthole. The ape has turned so that we can see the cement mixer behind him, at the mouth of the cavern.
Warrior: WANT? WE'VE GOT ALL WE NEED.
Panel 4: Close on the cement mixer as it starts pouring cement.
Warrior(OP): YOU JUST HAVE TO STAY RIGHT WHERE YOU ARE.