Watson made a prudent and proper decision here.  The motion was perfectly legitimate but the real donnybrook is going to be at the top levels of the Judiciary and Executive branches, so it's wise to let it play out there.  

The underlying question is whether it's Trump acting unilaterally, or the Supremes fleshing out their ruling, who can decide what constitutes a "bona fide relationship" and whether the effective date of the EO can be changed arbitrarily from its original date to a new one six months later.  

I don't think there's any doubt who holds the cards.  It's the Court, who issued the ruling and has the authority to clarify it by settling these details at its sole discretion.  I can't say I trust them implicitly, but they're a lot more rational than Trump at this moment in time.