Case 3

They seemed fine the first time, so you agree to meet alone next time.
You ask your sibling to give you a call 10 minutes into the meet-up in case you want an excuse to leave.
You meet up in a busy shopping centre, and everything goes well. You like the same movies and agree to see a film together the next week.
Lesson: This meet-up turned out fine! It still could have been a risky situation, so letting someone know where you are and having an exit plan are good habits.