Snake detecting spells: Canon!Harry sucked at Occlumency.

Eliezer was clearly thinking ahead.

We've heard of wizards dodging spells.

I think you forgot the 37(?) Death Eaters pointing their wands at Harry. You also forgot Voldie's famed reflexes, and a bullet definitely goes faster than a spell.

If what he said back in front of the Dementor is true, Voldie can't cast the Patronus regardless.

Such a thin chain of carbon nanotubes like that would have almost no mass, ergo no force. It'd be like if you could make a string perfectly rigid and then you hit something with it.

Ah, I see. I was also working on the assumption that McGonagall was correct; no reason Dumbledore couldn't say he was leaving, head to his office, sit back, and watch.

Dumbledore was absent from the castle.

And he made it sound like the wards only alert him when a student has died. It's reasonable to expect them to warn ahead of time, after serious injury or something, but going by canon Dumbledore had no external alarm when Harry broke however many bones however many times on the Quidditch pitch.

Not to mention infeasible, what with his nigh imprisonment.

When I'm not in the mood to talk to people- not out of anger, I'm just not feeling a desire to share my thoughts- I think in pictures and feelings with a reticent, sarcastic monologue. When I'm alone but feeling social, my monologue is wordy and sometimes witty. When I'm in a conversation, I often have to stop talking for a moment to think through what I'm going to say before I can say it.

Bottom line, I almost always have some kind of monologue; sometimes it's talkative, sometimes nearly silent.