South has a 6/5 hand. Normally when you have a 6-5, you will try to insist on one of your suits. Here, however, partner opens 1♠ and you have to be a bit more cautions, for any of spades, hearts, or diamonds might be the right contract. Furthermore, in most systems, you will have to start with 1NT because a 2/1 promises either a rebid (10+) or is game forcing (13+).
After 1♠-1NT, North will typically rebid 2♠, but some North's might try a creative 2♣ to allow partner to describe his hand. After showing the 6th spade (and usually a minimum type hand), South again has a problem. The void club could be quite useful in spades. If south could make a trial bid in spades, he would, but most bids now are natural and sign-offs. Thus, a few Souths will venture the only trial they have: 3♠, and I believe North should pass.

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