Every premium seller eventually watches a cash-secured put go deep in the money and keep going. What you do in the next few sessions decides whether it's a tuition payment or a crater. The defense playbook has exactly three pages, and the skill is reading which page applies.
First, diagnose: is the thesis dead or just bruised?
Separate the stock from the position. If the drop is market-wide or sector noise and you'd still happily own the company at your strike, you're holding a paper drawdown on a plan that's working. If the drop is the business changing — guidance slashed, fraud, the product cycle breaking — the trade's premise is gone and everything that follows is exit management, not defense.
Page one: roll for credit while the thesis lives
Rolling out (and down when possible) for a net credit lowers your eventual basis and buys recovery time — it's legitimate defense while the company is fine. The two hard rules: never roll for a debit, and never roll past the next earnings just to avoid a decision. If this is your third roll on the same position, stop calling it defense; check the chain's total P&L and make the honest call.
Page two: take the shares and work the basis
Assignment converts your put into inventory. Your effective basis is the strike minus every credit collected — often meaningfully below where the stock trades. From there, covered calls above basis grind the cost down further each month. This page only works on stocks you actually want; it's the whole reason the ownership question came first.
Page three: cut it and log it
When the thesis is dead, the cheapest exit is usually the fastest one. Buy back the put, take the loss, and write down what you saw and when you saw it. One honest journal entry — "ignored the guidance cut for nine days" — is worth more than the loss costs, because the count of those entries is what stops the next one. Losing trades are tuition either way; the journal decides whether you get the credit hours.