Fifi is usually a very voracious gal, she would either lure her prey to her, or just knock them unconscious via her tail and the smell that would come from it (like how it is with cartoons because fuck that with spray lmao)
 
She's also like that with Hiro (minus the knock out unconscious part), though Hiroshi usually avoids her if she is in a digestive mood as he still hates that stuff, he just allows him to devour him when she is in an endo mood with him