Killswitch, Attack Step and Blinkmoth Nexus

[LotusHead]

I am playing Crushing Chamber (artifact aggro deck) and my opponent sided in jank hate card Kill Switch, with tapss all artifacts in play.

He taps all my stuff when I declare that I'm gonna attack, but luckily, I have a Blinkmoth Nexus out.

Question #1:  Am I able to still pump mana into Nexus, make it a creature, and then smash face for 1 each turn? (as opposed to smashing face with 27/8 Arcbound Crushers and an army of Myr tokens)

I am pretty sure I can, as I haven't picked attackers, and my opponent responded to the "combat phase" by doing stuff.  I regain Priority, make my land a man, and (after briefly passing priority back to opponent), then turn Nexus sideways for the win.


Next Priority related question:

My opponent casts Timewalk. I Force. He TwinCasts Timewalk. He walks on Twincast Timewalk.  There is no problem here.

Question #2:  However, if he casts Time Walk , then passes priority to me, (since I play lots of blue counters), and I say "sure, go for it, it resolves...", can he then Twin Cast it, or does Time Walk now resolve when I pass priority back?

I am pretty sure that if my opponent casts a spell (like time walk) and they pass priority, I can simply pass priority back, forcing the spell to resolve now with no more "in response I do this and that" kind of stuff.

Thanks in advance.

[Gabethebabe]

You´re correct in both cases. In the "Beginning of Combat Step" he´ll activate the Switch, you wait until it resolved and then activate your Nexus.
You can do a pretty amount of damage with your Nexus, if you have Ravager and lotsa Myr tokens in play.

In the next question: yes, your opponent has passed priority and if you do the same, the first spell on the stack resolves. He has to cast Walk, respond with Twincast and then pass priority.