Chaos:
In chess, the 50 move rule is 50 moves for each player.
That being the standard, it is implied unless stated otherwise. If one player makes 50 moves and the other had made only 49 since the last capture, the latter could prevent the draw rule taking effect by capturing that move. In any case, if a capture is not made and neither player invokes the draw rule, the game continues. The draw rule could be invoked any move thereafter until a capture is made. Once a capture is made without the draw rule being invoked, the 50 move rule starts over notwithstanding it could have been previously called a draw. That is to say, if a player wants to invoke the 50 move draw rule, it must be done both after 50 moves without a capture and before a capture is made.
A sapper deactivating a bomb is considered a capture.