It is:
Substitutes for members who are officers of the committee (for example, its Chair or Vice-Chair) do not, however, assume the prerogatives or responsibilities related to these positions.
At meetings, the very principle of substitution means that it may occur only when the substituted member is absent from the meeting.
As we know and we all saw, MP Hallan was still here in the room as MP Genuis came through—I don't even know if he was sitting at the table—and started going on at the mic about whatever he was going on about.
That is my ruling, members.
MP Genuis, if you want to look at the House of Commons...that's my ruling.