You defend in Batak by working to stop the top bidder from capturing the number of tricks they promised, forcing them to go bust. Since the bidder committed to a target, every trick you take away from them brings them closer to failing. Lead suits you think will be awkward for them, and hold onto high cards or trumps that can steal tricks they were counting on. In team Batak, partners coordinate through their plays, without table-talk, to squeeze the bidder. Careful counting helps you see when the bidder is one trick short and vulnerable. Denying just one needed trick is often enough to win.