Heh. What's funny is the first play through - I saw that "opening" and it immediately reminded me of the vent (back on Nostradamus) and so the first thing I did was switch to Rooter and click the walk icon there - and in he went. (He also goes in if you use his "nose" icon).
So I didn't even get the chance to think of "Hey, use Rooter's head to try and grab the pipe."