I wouldn't be surprised if this would be another kind of test but now only exlusive for May,to test her for real,maybe another kind of illusion/dream.
She had resisted Glyph/or someone else who looked like him,but Bern failed due to her total zero resistance to magic,and rather weak head.
If that girl which we see partialy in this new page would really be Regina,or rather one of these sisters who would took her form,then I wonder if May could resist,after all she had a crush for her.
And that's a weakness which Moss could rather easily give out to these sisters.
But if all these guys are working for the Thin Man,and judging from Mary that guy rather isn't nice person,I'm a bit afraid what could happen to Bern cause she was rather useless for them.