the redhead is pissed beyond belief LOL...epic shit
I'm an avid Critter, got into CR just a month or two after they started streaming, been to 3 of their live shows (LA, London, Austin) and this was the only time I considered Matt to have utterly failed as a DM. Hell, even the other players failed, to an extent. I think it's awesome that Joe *wanted* to steal the hand, but it's complete bullshit that Matt allowed all that went in to it, without any other player doing anything.
Arkhan cuts off his own hand - 1 action
Arkhan attaches it - arguably free (interacting with object), but still something
regenerates himself - 1 action
say "i'm sorry it was just business" - not an action necessarily, but still time spent
cast teleport - 1 action
ALL of that (18-24 seconds of 'time') transpires while this group of literal LEGENDS sits around with their collective thumbs up their asses. Now, if all 7 of them want to say "I sit and watch, mouth agape, as Arkhan claims the essence of the demigod we just spent months in conflict with", I'd allow that (but think less of them). But Matt definitely should have said to the other players, what do y'all do. Essentially "do you react or not". I understand the players themselves are taken aback by the betrayal and rendered speechless, but their characters are legendary heroes, and would not (necessarily) have the same reaction. Which is why Matt absolutely should have stepped in.
And before you say "rule of cool bro, rule of cool!" Arkhan definitely could still have gotten away with it, even if Scanlan throws a counterspell and Grog tries to grapple (IE followed combat initiative). Hell, that would have made it even MORE epic if he had succeeded. Instead of just "I take it and leave lol." On the spot I would have directly asked the players if they reacted, but as I type this I thought it'd be better (hindsight 20/20) to just re-narrate Arkhan's actions in an attempt to snap my players out of their daze. So just after Joe says his stuff, I'd say something like "you watch as Arkhan's axe slams down, severing his hand from his body, blood spurting from the newly formed stump. He quickly grabs the Hand of Vecna and places it on his arm, his skin glowing as he channels healing energy. He then raises his new Hand, looks at Grog and says 'I'm sorry, it was just business" and begins to cast teleport." And I'd be looking my players dead in the eyes, thinking HELLO, HE'S TAKING THE HAND OF VECNA, WAKE UP. Then, if they STILL didn't react, ok, Vox Machina completely and utterly failed right at the finish line, but at least the gap was bridged between stunned real people playing a game and uber fictional characters being heroic.
tl;dr I refuse to believe that every one of those badass heroes in Vox Machina would simply sit and watch as Arkhan did all that, and Matt should have given the players at least one chance to react as their characters would react. Yes, Arkhan had been a good guy & compatriot so his betrayal would be surprising/confusing, but the Hand of Vecna is practically the Evil to end all Evil, and any fucking with it should have spurred most (if not all) of those characters to react to some degree, despite them being drained from the epic battle they just had with Vecna.