He's cleared of conducting Secret diplomacy, as stated in rule 2:
"Any form of diplomatic discussion between opponents must be posted in the game chat in English or in a language that all opponents understand. Diplomacy includes, but is not limited to: proposing truces, negotiating alliances, and coordinating assaults."
Asking for a truce or a coordinated assault IN game chat is not against the rules.
Schrijver van de sage van Mecran, deel I "de Zilveren Poort" binnenkort verkrijgbaar op boekscout.nl
Pm voor meer info!