Start from the beginning.
1 - Panel in the same vein of the last panel of page 4. The same far off shot of the desert, but it's now night. The moon hangs high, but it's mostly covered by dark clouds - the storm has arrived. Lightning arcs through the sky in the distance. Flint's in the process of getting up, while Squirt is gone (depending on the distance, a damp spot on the ground is left in his place).
2 - On Flint, standing and looking down at the damp spot on the ground where Squirt once was. Flint's as intense as ever, but it's tinged with sadness.
FLINT: Sorry, Squirt.
3 - Flint walks towards the storm (and away from the reader), with the lightning forking across the sky ahead in huge, elaborate spiderweb-esque patterns. The lightning strikes with such frequency to the point of lighting up the night.