"If not that, then a wall to keep the army locked in place while Wei Wuxian's reinforcements sweep through. Hopefully, Wei Wuxian's reinforcements reach us before we reach the farmhouse." He spoke from the authority of experience in battle.

"Keep your thoughts focused when you apparate where you need to go."

If she splinched herself Regulus would have to make a choice between keeping the undead pinned and coming to help her. But in order for her to keep on top of rogue flames - and Regulus would be doing his best to keep a strong mental check on where the fyre spread, this was just a tricky spell, and Lily was the necessary backup - Lily would need to do a fair amount of apparating behind the army.

"We stay in contact with the quartz when we are apart. Are you ready?" He would give her a moment to queue up her spells if she needed it.