what would happen in a case where two robots are hanging on each other. one high hanging and one low hanging? also if a red robot is hanging on blue robot would it count as destroying the other robot?
The definitions of both low and hanging have no reference to contact with other robots.
Yes, this would be illegal by rule <G11> and considered either or both intentional entanglement and intentional destruction.
<G11> Strategies aimed solely at the destruction, damage, tipping over, or entanglement of robots are not in the spirit of the VEX Competition and are not allowed. However, VEX Round Up is an interactive game. Some incidental tipping, entanglement, and damage may occur as a part of normal game play. If the tipping, entanglement, or damage is ruled to be intentional, the offending team may be disqualified from that match. Repeated offenses could result in a team being disqualified from the remainder of the competition.