SO there's a bit more going on here. we do not trigger blood roar until AFTER the unit within 8" has already taken the battleshock test. then the wording on Inspiring Presence is that they do not take the test at all and that it must be triggered at the START of the battleshock phase.. so... the opponent MUST decide to use IP BEFORE ANY tests are made. Once one battleshock roll has been made we are no longer at the start of the phase, so the command cannot be used to save the unit once you have reminded your opponent about the ability. in a friendly game I would not hold the timing against my opponent, but in a competitive environment I absolutely would.