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Initially, to me it looked like "BB" was holding a bomb of some kind, but looking at it again, I think i can see the handles of work tools? So it's like he's got his "uniform" or something belonging to his slave number wrapped around his tools, like a pack. There kinda looks like there's a handle too (in the smaller red square)
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I agree about the work tools or something of the sort. I mean he looks frightened, his mouth isn't sewn shut nor are his eyes so maybe he's in line to go to the mines(against his will of course).
I don't really think they're preparing for war though. I mean originally Exodus was right after Oddysee right? I don't think the timeline would add up.