Grif can travel really quickly.
I was watching Season 1, Episode 1 of RvB, and I noticed something peculiar about Grif's placement in his first lines.
Here, you see Grif at 13 seconds into the episode:
Here, you see Grif at 26 seconds into the episode:
Notice anything? The backdrops for their locations are different. So different, in fact, that when Grif first appears at 13 seconds, it looks like he's on blue base.
One piece of evidence to suggest this is in the terrain. Red base on Blood Gulch has a shady hill behind it. That hill is definitely seen in the 26 second shot, but not in the 13 second shot. The terrain in the 13 second shot is flat and sunny, just like the area behind blue base.
More evidence can ...