V wanted to make his test as fast as possible since he didn't want the rest of the group to wait outside in the rain. Still, he also didn't want to make it easy for Red no matter how tired both of them are. He was caught up in a dilemma. Either make it hard for Red and drag the test on or make it easy and Red wouldn't even see it as a challenge.
In the end, V decided not to think about it.
Masking his presence, he approached the trio without making a single noise. Being an experienced Leader in the field once with the special ops under him, V was probably one of the best soldiers out there who could completely hide his presence. Of course, he doesn't do it from time to time since that would just make him suspicious to Red and the others. But now, he wanted to try it out once again on his son.