If you have more alt or E before the initial merge then you are CHEATING.
Nope, it is only cheating if you do it after you agreed not to.
There are such things as no rules, no holds bared duels where both players agree that anything goes.
Also, rules need to be carefully stated or they can be open to interpretation. For instance calling the altitude of the merge, in plain language only states how high you must be at the merge, not before or after. If you mean that neither party can be above a certain altitude before the merge it is better to call it a ceiling and actually state and agree that it is a never to be exceeded altitude limit. You can't accuse someone of cheating unless you remove the possibility of misunderstandings, after all, it is only natural to seek every advantage
within the rules in any sport or game.
Reference to standard rules doesn't work because you can't guarantee that everyone will know them and if I duel someone who won't agree the rules I consider it to be an anything goes engagement.
Proton