Sams Wedding<br>The big day had finally come, Sam was going to be married. After getting ready, her bridesmaids met her in the hotel lobby. Waiting, the limo was over an hour late. After a few calls, the limo had been parked just out of sight. After entering the limo, Sam screamed at the driver for being late.
Sam screamed over her bridesmaids after she got in the limo. 
The context does not indicate that the bridesmaids were speaking the system did not recognize that speaking over meant that they would be speaking/screaming also. 
( z1 scream :ARG0 ( z2 person :name ( z3 name :op "Sam" ) ) :ARG2 ( z4 person :ARG0-of ( z5 have-rel-role :ARG1 z2 :ARG2 ( z6 bride ) ) ) :time ( z7 after :op ( z8 get :ARG1 z2 :ARG2 ( z9 limo ) ) ) )