I also don't think Salaar will save her. Even her step mom dialogue suggest so
log mohabbat mein aag ka dariya ter karte hain aur woh doh solah nahi fanan kar saka something like that
Also, its being imaan, his emotions will be more strong and he will be more paralysed.
But, despite that I am sure Imaan being calm even in adversity will find a way. She might be angry with him which will also make sense I think will eventually understand him. Salaar will be guilt stricken though. Imaan said he was feeling guilty about Imaans dad ab toh Imaan ki baat horahi hain. Also now that Imaan knows that someone pushed her I hope she use her brain to finally guess that Salaar mom too was murdered.
Salaar though if he really loves Imaan should take strict actions regarding his criminal family. I was already annoyed why he can't sense trouble for her when literally even Imaan father could sense it. Only loving is not enough, you should also be able to protect her.