Sometimes staying put is harder than fighting. The only way Gohan can make sure they survive is by hiding and protecting Bulma and Trunks.
Ironically, he'll die later while still trying to protect Trunks.
This picture is in the Future Trunks timeline and it's my interpretation of how things went down.
Yes, I know they supposedly died in a different order in the series and/or movie. It's called artistic freedom, damn it!
This is the biggest deviation I've ever worked on and my first real background. Many, many, many hours I've spend on this and I'm pretty proud of it.
DBZ © Akira Toriyama