Yes. [Delivered flat and slightly unimpressed, though inside, he's somewhat impressed that Sebastian lived through the experience. Honestly. Who sees a huge death scythe and decides "oh yes, silverware will do quite nicely"??]
You tried to stab Undertaker with a butter knife. It was...not quite as effective as you were hoping.
[He's never seen the like before, and when the devices don't immediately explode in Sebastian's hand, Ciel pokes it.] What are they?