Since we started running feedforward on the BSC-ISI's, Jeff and Hugh noticed that the feedforward path is not controlled by Guardian. This means that if FF is engaged and the ready state is requested through Guardian, the St1 actuators will still be driving. From a safety standpoint, it looks like this probably isn't an issue. I took spectra this morning with the ITMX ISI off (FF off, too) and with FF only (no damping or isolation loops). The FF only state actually still provides some isolation above 1hz (see attached plot, dashed references are the off state, solid lines are FF only). I also turned HEPI off, then turned it back on while watching the ISI seismometers, and didn't see anything obviously terrible. The actuator signals stayed below a couple hundred counts the whole time, much like the ISI with damping only, and only the T240's got agitated while HEPI servoed to position, which is normal. It's still possible that whacking the HEPI piers could cause FF to do bad things, so...don't do that.