I'm a well read grad student who's bluntly honest about all things, although I try to be most honest about myself.
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I believe they went in because Bee and Ratchet couldn't, actually. The entrance that they knew of was too small, and they didn't want to out themselves at that moment, from what I can tell.
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This just feels like an outright lie: they not only looked for them, they talked about how, and why, and their priorities, and how badly they felt they couldn't look for them more when they weren't actually looking for them.
Sideswipe kept begging to come in from Cybertron to look for them.
Like, no to this, no. I also had heard about this.