Well, here's the USAT rule (dont' know what set of rules govern the IM NZ) on assistance:
Note that the "assister" can be a fellow athlete. By the way, as a USAT CAT 3 official, you can't really tell from the picture if any USAT rules were violated. Obviously, the picture suggests a position foul and/or an assistance violation.
FIST Certified Fitter
Salt Lake City, Utah
Unauthorized Assistance. No participant shall accept from any person (other than a race official) physical assistance in any form, including food, drink, equipment, support, pacing, a replacement bicycle or bicycle parts, unless an express exception has been granted and approved, in writing, by USA Triathlon. The receipt of information regarding the progress, split times, or location of other competitors on the race course shall not be considered the acceptance of unauthorized assistance. Any violation of this Section shall result in a variable time penalty.
Note that the "assister" can be a fellow athlete. By the way, as a USAT CAT 3 official, you can't really tell from the picture if any USAT rules were violated. Obviously, the picture suggests a position foul and/or an assistance violation.
FIST Certified Fitter
Salt Lake City, Utah