The throw bag: a rope is only as good as the person holding it

The throw bag is the most common piece of rescue equipment on any river and one of the least practised. People buy one, clip it to the boat, and carry it for years without ever throwing it at something that is moving away from them at the speed of a river.

That gap matters, because throwing a bag well is a physical skill with a narrow window, and the first attempt is almost always bad.

Set up before you need it

The throw happens in a few seconds. Everything else has to be done in advance.

Stand where you can see upstream and where the swimmer's line will bring them within range. Below the rapid, not beside it. On the inside of a bend where the current pushes toward you, not the outside where it pushes away.

Set your feet. You are about to take the load of a person in moving current, which is far more than their body weight — a swimmer in a decent flow can pull surprisingly hard. Brace low, one foot back, knees bent. If there is a rock or a tree to sit against, use it.

Open the bag and take the loose end out. Hold that end firmly — foot on it, or a bight in your hand, never wrapped around your wrist or clipped to your harness. If you are tied to the rope and the swimmer loads it in fast water, you go in.

Get their attention first

Shout. Whistle. Wave. A swimmer looking downstream at the next hazard will not see a bag land next to them, and a rope that arrives unnoticed is a rope that has been wasted.

One clear word — "ROPE" — then throw. Aim for the swimmer's head or just past it. Slightly beyond and across is much better than short; you can pull rope in, you cannot add it.

The throw itself

Underhand is the most reliable for most people. It is accurate at close range, it works from a low braced stance, and it keeps the bag flat rather than looping high.

Overhand throws further and is worth having when the swimmer is out in a wide channel. It is less accurate and it takes more room behind you.

Whichever you use, throw the bag, not the rope. The weight of the water-filled bag carries the line; trying to throw a handful of loose rope produces a tangle two metres away.

Lead the target

The swimmer is moving. The bag takes time to fly. If you aim at where they are, the rope lands behind them, which in a current means it lands somewhere they will never reach.

Throw downstream of them. How far depends on the speed of the water and the distance, and the only way to develop that judgement is to do it repeatedly on real current with a willing volunteer.

After they have it

Do not haul. Let the current pendulum them. Keep the rope under tension and let the river swing the swimmer into the bank on an arc. Hauling straight upstream against the flow does very little and can pull a swimmer's head under.

Move downstream along the bank as you do it, keeping the angle working for you. Talk to them. Tell them to get on their back with the rope over the shoulder, facing up. A swimmer who holds the rope in front of their chest gets water forced into their face.

The second throw

You will miss sometimes. A missed throw leaves a bag full of loose rope on the bank and a swimmer still going.

The fast reset: pull the rope back in coils, stuff a few armfuls loosely into the bag, and throw the bag again. It does not have to be neat. A messy bag that leaves your hand in fifteen seconds beats a perfectly packed one that takes ninety.

Better: have a second person with a second bag positioned further downstream. Redundancy on the bank costs nothing.

Practise the way it will happen

Throwing at a target on flat ground in a car park builds a little accuracy and nothing else. Throw at a person swimming a real rapid on a warm day. Take the load. Feel how much force comes through the rope and how quickly your hands get cold and stupid.

Then swap and be the swimmer, so you know what it looks like from the water — how small a bag appears, how briefly it is in reach, how much a clear shout helps.

Two sessions a season is enough to keep it. Nobody who has actually done it thinks the practice is optional afterwards.