Jim Thompson wrote:
As one who's never used a relay before in anything critical I come up
with a dumb question...

Do relays "bounce" when they are OPENING enough to re-contact?

...Jim Thompson

Yes, but nothing at all like the magnitude and duration of
the bounce on closing. In general, you worry more about
arcing on break and bouncing on make. For example, if you
put an RC snubber across the contacts to minimize arcing, the
current that was flowing through them keeps flowing when the
contacts open - through the snubber. Thus the rest of the
circuit is "unaware" that the contacts have opened, and will
also be unaware if the contacts re-close on a bounce. The
contacts "appear" to be closed during that bounce.

Ed