Francois is stuck in a small alcove near a cement mixer. To reach him, tap the button on the cement mixer. Climb up the nearby Cat Scratches and touch the two white 'feet' to move them down. Glance up at the machine and shoot the button to load the grinder with sand. Once that's done, press the switch to get the sand moving. Finally, switch to Rico and exit to the nearby pool. Tap the underwater switch and transform back into Juliette. Finally, press the button on the cement mixer for it to pour cement into the pit, allowing you access across to save Francois.
Francois switches places with Dwayne. Francois can now be found stuck inside the helicopter you see near the beginning of the level. Shoot the glass and button inside and it will open up for you to rescue him.