Rodriguez was spotted by a witness running away from the stairwell where the backpack was found seconds before it went off.
Rodriguez was on a calm stroll when the witness saw him.
( z1 stroll :ARG0 ( z2 person :name ( z3 name :op "Rodriguez" ) ) :ARG1-of ( z4 calm ) :time-of ( z5 see :ARG0 ( z6 person :ARG0-of ( z7 witness ) ) :ARG1 z2 ) )