The moment that Solus happened to be attacked, some of the tranceful senses cleared up as Beatrice saw that there happened to be another fight beginning. Even if she was healed up, her magical prowess hasn't fully returned due to Erika's victory over the witch, so Beatrice backed away as she felt the intense energy coming out of this fight. 
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"Try to do that, and it will be a rare sight for you to see day again. Last guy that tried to do that, I buried and drowned that person in tons and tons of gelatin," Lambdadelta said, this being the most threatening thing she had said this entire time. It was then she realized that Joan appeared transparent, like a hologram. She would assume this was some spirit or essence form, as that was how Battler went from a regular human, a spirit, and into the Endless Sorcerer.