He draws a dozen almost-completed identical summoning circles. Time is short and the stakes are high but a dozen circles communicates 'I am going to keep trying this until I find someone who's inclined to help' and sometimes that makes negotiation go a little better.
He has them triple-checked in person and sends the pictures for a dozen more people to scrutinize. That is just ordinary good practice and under the circumstances practically feels inadequate.
At least if he erred catastrophically and the daeva feeds Araman into a black hole only a few dozen people will die. Unless you count Endorë, where hundreds of thousands of them are dying every day.
He steadies his heart rate, smiles pleasantly, and finishes the first circle.