On landing and holding short

A commercial pilot I was chatting up recently told me that, in most
European countries, the use of forward thrust is illegal.

Makes me wonder what would happen if a 747 was instructed to land and
hold short but the craft can't be brought to a halt (because of, say,
an error in landing beyond the right spot or due to some skidding on an
icy surface) before an intersecting runway, with another 747 on its
takeoff roll there?

Does anyone know whether the forward thrust ban isn't too strictly
applied when safety is on the line?

Cheers,

Ramapriya