SMH, i thought it was A vs B. Well, then , natsu is taking this round unless other 3 decide to team up because his savage flames can burn magic and time itself, i don't think most has answer to tht. But tht will leave natsu harmed too and also on the contrary, i don't think any could make him use tht in this grp at least.There is no teamwork here, is there? By rules nobody acts "in character" here and tries their best to win.
Meh then, if she is on her own, then she has to focus more on fire power than tht. which i think she still has it.She used it on a bunch of fodders in the beginning of the arc, and some resisted. Should be in around the chapters where Ajeel vs Erza happened