FreeSWITCH Version 1.0.head (git-) from 5/28/10

I have a lua script called from the dialplan that bridges the call with

session:execute("bridge","{route=sofia/gateway/US/15555551212} sofia/gateway/US/15555551212")

after the call ends, I am trying to get some variables out of the Bleg session, the bridged leg. But I do not have a session handle to get the variables. I know what the uuid is from global variable_bridge_uuid. But how can I get the session of the B-leg so that I can do a getVariable()? The variables I want are not available in any of the global variables I can see with info.