I was playing against Cryx at the weekend and something came up. I'm pretty sure we resolved it correctly, but I felt it best to check.
Basically, Bane Knights trundled up the field with Tartarus nearby. Sorscha, with help form Sylys, casts Freezing Grip, rendering all bar Tartarus Stationary.
Tartarus, with help from Darragh Wrathe, gets a charge off on my nearby Winterguard, Threshering two and adding two Knights to the unit.
Now, the issue was, are the new additions Stationary? The logic was that Freezing Grip affects the whole Unit, of which they are now a part. In the end we decided they weren't; FG had been cast and was not still in play, but it had caused lingering effects similar to Venom causing corrosion. These didn't apply to the new models because they weren't in play at the time of the casting. Is this correct?
The other, linked effect was him then trying to charge with the two new additions, which I said he couldn't do because the Unit Leader was currently a vaguely sinister ice sculpture and thus unable to give the charge order. Is this also correct?