This is one of those KISS spots, I.E. keep it simple stupid. S1 just needs to resort to common sense and plan on throwing away the Ace that's least likely to take a trick. The AC stops 5 cards, the AD stops 4 cards, and the AS stops 3. The AS is the clear loser here and thus should usually be the ace we throw away. That's at least our starting plan. It's possible our P could signal us to abort that plan.
S1 should lead off with his best Ace, the AC, then on 2nd street he should play the KS which emphatically tells his P he is not covering spades. On 3rd street, he should play the TS and on 4th street if the maker is still leading trump he should throw the AS away hoping to save the day with the AD on 5th street.