You could try setting a repeat count to the SEXP, then make the SEXP become false when you want the shields back up. And it might be an idea to also set the shields to 100 when they do come back up, if you are doing the kinda thing I think u r doing
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"Supernova, ya supernova, supernova goes pop
supernova, ya think it's over but the supernova don't stop" PM5K
Death:"Arnold Judas Rimmer... your life is over. You will travel with me to the-"
#knees death in the groin#
Rimmer:"Remember matey, it's only the good that die young"
"Do not fear the chickens. Become one with the chickens. Respect the chickens and... #BOK!# LEG IT!!!"
The Claw... project coordinater of Alternate Reality and Story-line help-guy of The Perfect Storm.