Ditto on the above. If the fish is running downstream I point my rod butt slightly upstream with the tip in the water (making the rod into a giant letter 'C'). This maximizes the work done by the rod relative to the line and can usually stop a fish if your not completely undergeared.

I free spool as a last resort. It does work, the few times I've done it, the fish has turned by himself and come back upstream. But on more than one occassion the slack line has snagged on the bottom or wrapped around a rock and I wound up reeling in a bunch of frayed line.