If I make an attempt to open up part of the veil... Well.

[She ponders and the continues.]

Unlike your entrance which was unintentional, there are always other things trying to get in. That is the risk that I am talking about here.

[So if she helps him something just as bad or possibly worse will jump at the opportunity to claim this realm.]

You could say the reason why magic and witches exist in the first place is to fend them off.