Originally Posted by Ash_Smith
Sennoc - timing of the foot placement on the volly depends on the height of contact. Low volley and the foot does plant just before the contact (step before the hit). Mid-high volley and the contact takes place during the step (step during the hit) and for high volleys the contact comes first (contact before the step).
From what I saw of TonLars forehand volleys in that vid, they were dropping below net height so his footwork was spot on technically.
If you want to be technically perfect then you should know and incorporate this into your own volleys.
I just learned a lot about volleys from that post.