If he drops anything on Israel, Damascus will be a nice new piece of glass along with the rest of Syria. The Jewish religion and its people have suffered enough in the way of pogroms in the past 100 years, the slaughter of millions in an industrial scale, do you think they would sit back and allow someone to throw Sarin/VX at them.
In the words of the Israeli PM after Operation Yontan in 1982, if we had acceded to the demand s of handing over prisoners, the world would have understood but few respected as it is the world does not understand us but all will respect us. The Israeli state of mind by being surrounded by either enemies or the sea.
Akrotiri movements maybe an APC from the OCU and force dispersal, wouldn't you if the threat from air attack was real.