Jeff overall was speechless for a good chunk of the moment. He was entirely caught off guard from this due to him spending his last few moments trying his best to explain the training situation and his opinion on it and especially didn't think his and Mikey's arcane clash would bring his nanos to life as a puddle. For several momwnts Jeff stared wide eyed at the acidential creation of Mikey and him, trying his best to analyze this entire thing. Finally though, Mikeys question brought him back to reality once more where he finally spoke back 
"A mixture of mine and Mikeys arcane power along with enchanted nanobots... I knew the process could have side effects but nothing like this... I really would want to reasearch into this more, but I wonder if I have the time with everything that is going on right now."