Check out this article just released last week. This is why you should not do F2F trades with a stranger, unless it's just a small about to buy small goods
Let's take a look at the three incidents discussed in the article:
The man was lured into an industrial building
The criminals coaxed her into an office
after he sent the cryptocurrency, they kicked him out of the vehicle.
Every single one made a very basic mistake of not trading in a public place. If someone asks you to go somewhere with them, be in to a building, an office, a warehouse, a vehicle, whatever, then it's because they want to do something there that they don't want to do in public. There is no scenario in which that turns out well for you, and is a massive red flag which should lead to you immediately walking away from the trade.
Bisq have a nice guide on face to face trading here:
https://bisq.wiki/Face-to-face_(payment_method)#Meeting_your_trading_partner. If you follow all these steps, the chances of something going wrong is very small.