"I will wait, then, but not for long." Viktor answers, because he is somewhat suggestible in this state, easy to reason with in a practical sense while so lacking in emotional drive. The caveat is that his purpose is unalterable. Find Jayce. Be with him. This must be accomplished, the means do not matter beyond the outcome.

It will give Serph a head start, at least. Viktor isn't swift in this form, grounded due to a lack of any wings or levitation ability. He's on foot speed at best, having abandoned his vehicle back in the Convoy area. Much better that Serph discover Jayce than Viktor, who only upsets his partner's monstrous instincts all the more in his present form as the Herald.