Zeph didn't like the feeling that came with basically sitting on his hands and doing nothing other than basically babysitting highly trained professionals and whipping blood off an excited vlasordon who wanted to continue playing hide and seek, but he knew that he was out of his element when it came to processing a crime scene.
He had received some degree of training on the subject, but it was just basic training such as not directly touching anything unless absolutely unavoidable and that he would not want to take a blacklight into his bedroom or most hotel rooms. Zeph was smart enough to know that the best thing he could do was watch and learn, other than keeping Rex out of things.