4. Reserve assistant referee
The provision as it is printed, and everything on Ruleside that turns on it.
A reserve assistant referee may replace an assistant referee, fourth official or additional assistant referee who is unable to continue, and may also assist the referee in the same way as the other ‘on-field' match officials.
Verdicts that turn on it 1
Walk the tree to any of these and this clause is part of the answer.
The Laws of the Game are published by The IFAB and quoted here for the purpose of explaining the decisions on this site. Ruleside is not affiliated with The IFAB or FIFA. Every clause of The Other Match Officials that Ruleside cites.