A situation

Interviewed with BB Firm for SA who had 2 FT associates, 3 FT analysts before. Eventually 2 FT analysts left to other firms, and I learned the last one left (or is leaving) to another firm as well from a source that's not working in the firm. They have already secured a SA for this coming summer, and managed to get an analyst transferred in from same firm diff location, and brought in another analyst from accounting BG. Now is there anyway for me to offer up my services again to this BB to see if they need any help in the summer?

If so, how should I phrase my email to make it so it's like "i am in the know" like people leaving but not from a specific source since I don't know if the last analyst has left for the other firm yet? I don't want to screw the analyst over if he hasn't left yet. How should I phrase my specific sentence to make it more professional?

ie. To me... "I just learned that "Analyst A" is leaving, and was wondering whether you'll be needing additional help in the summer" sounds a bit too invading, and not professional at all. so any help in phrasing the email is appreciated. Thanks