So I noticed something before fighting GLaDOS. Something I haven’t seen anyone in the Portal fandom point out. Something very important.
Remember what the red phone does? It’s a shut-off mechanism for GLaDOS. You lift the phone off the base and GLaDOS powers down. It was how they shut her down so quickly everytime she tried to kill the scientists.
Take a close look at the important red phone in the picture.
The cable on it has been snapped.
Now look at this situation logically. I haven’t moved anything in the picture. It’s like this when you walk in. The phone is still on the base.
This means it wasn’t snapped by someone pulling too hard from panicking during the neurotoxin emissions.
It was snapped by someone on purpose and returned to its base.
Someone sabotaged the GLaDOS shut-off phone.