A good answer names the mechanism, not just the warning. It explains that a criminal can intercept an email thread near closing and send fake banking details that look like they came from your lawyer's office, often from a slightly altered address, and that funds sent to the wrong account are very hard to recover.
It also gives you something to do, not just something to fear. Call your lawyer's office at a number you already have, never one from the email itself, before confirming or updating any banking detail, and expect your legal fees, typically $800 to $1,500, to be handled through the lawyer's trust account rather than by wire instructions in an email.
Joel Dyck raises this with every client near possession day, because the few minutes it takes to phone and confirm is the entire defence. Get your hand-reviewed valuation from Joel Dyck.