The BU could have made the correct call depending on which runner missed home plate. If the lead base runner (R1) missed home plate, and the next runners (R2 and R3) then crossed home plate, then they passed R1 on the bases. Therefore, R2 should have been called out immediately, dead ball, and R3 goes back to the last base touched. R1 can subsequently be called out on a dead ball appeal at the plate. If this is what happened, then there does not need to be an appeal made for R2 to be called out and the BU is well within his power to make the call.