The white jack reaches the bank, bounces back onto the green, and everybody pauses. The correct call depends on where the jack was before the impact and how it moved.
A jack driven from the green
World Bowls law 21.1 says the end continues when a jack at rest on the rink is driven against the face of the bank and rebounds onto the rink of play. Do not declare a dead end merely because the jack touched the bank.
A jack returned from the ditch
Law 21.2 also keeps the end alive when a jack at rest in the ditch is moved by a toucher back onto the rink. A toucher is a live bowl that has contacted the jack in its original course and meets the law’s conditions.
Check the final position
After the movement stops, identify the jack’s resting place and whether it remains within the rink of play. Keep other bowls undisturbed while players or an umpire decide any close boundary question.
Avoid the common shortcut
Bank contact, ditch contact and leaving the rink are different events. Ask what actually happened in sequence rather than making a call from the sound of the collision alone.
Source: World Bowls Laws of the Sport, laws 18–21. Check your national regulations and event conditions before a competitive game.
The rebound is the start of the question; the jack’s legal final position supplies the answer.
For a shared view of close heads, try WGTS for iPhone or WGTS for Android. Use the official measuring procedure whenever your competition requires it.