unable to remove network bridge.

I'm trying to remove a Network Bridge and am having some difficulty.
I removed the bridge by right clicking on both of them when they were
highlighted but the Network Bridge symbol is still there. If I right
click on both network connections, again, when they're both
highlighted, I don't see an option to remove the bridge - the only
thing of relevance that I see is "Bridge Connections". Presumably
that means they're not bridged (since it's asking me if I want to
bridge them), yet the Network Bridge icon still shows up.

I right click on the Network Bridge, click Disable, and get a "It is
not possible to disconnect at this time. The connection is currently
busy with a connect or disconnect operation.". I don't know why it's
busy with such an operation, given that I never explicitly initiated
one and given that, as elaborated above, it seems to be disconnected,
but whatever. If the connection is active, how would I go about
stopping whatever activity is present? I've tried rebooting to no
avail.

I also tried to right and Delete the Network Bridge, but when I do, I
get "An unexpected error occurred while configuring the Network
Bridge."

Finally, would my seemingly unremovable network bridge prevent
internet connection sharing on one of the two connections that may or
may not be involved in the bridge? If I click on the Advanced tab of
my "Local Are Connection", I don't see the "Allow other network users
to connect through this computer's internet connection" checkbox...