That the failure to retouch after a dead ball puts the runner in jeopardy. Once that runner gets to a succeeding base, the runner may not return to the preceding base , the defense could appeal the failure to retouch.
That is, R1 fails to retouch on a foul ball, and on the next pitch, R1 steals second. The defense could then appeal the failure to retouch 1B.
(I can't back this up with anything.
)
mick