Cao Chun was silent for a long moment, tapping his gnarled fingers together. "I have reason to believe there will be an incident tomorrow. I suspect either a crumbling of the road up to the severed peak, spilling men and materials down to injury or death, or an incident at the road junction where our crews are finishing the connection of our warding networks. It will likely take place around the middle of the day, when I am occupied with watching over negotiations. It is very possibly meant to distract me, and allow something untoward."
The next incident is a two pronged attack. The culprits will cause an accident, and, while Cao Chun will be distracted with the "accident", they'll go and do some other thing at the actual meeting side itself.
However, we know ahead of time, so Cao Chun will be at the meeting and not fall for the distraction. He'll be looking out for the culprits at the actual negotiation table to determine who they are and the faction they belong to.
Now, we can prioritise the distraction, letting the enemy know that we're on to them (options 1 & 2). In that scenario, there is a high chance that they'll run off and Cao Chun can't catch them, since they're trying to be subtle. Since they'll be in the negotiation meetings too, they're probably important since they'll be able to hide among the high realms.
Or, we prioritise the other thing they're trying to hide from Cao Chun. If we prioritise that, there'll be a slight delay in arriving at the "accident", but they won't know we're on to them, so Cao Chun can spot them, identify the faction they're in, and disable the other thing that they want to do at the meeting.
Now, to me, the other thing looks waaay more important, since they're trying to hide it from a fifth realm cultivator specced for investigation, and since it's happening at the actual meeting sites.
If they get a tip off, they either won't do the other thing and spring it on us later (prioritising secrecy), when we may not be able to anticipate it, or they'll let go of all subtlety and do something at the literal negotiation tables, which can destroy the tentative peace we have here.
So, we can either prioritise the distraction, prioritise the other attack. Or, we can prioritise both, with weak support in each, and a chance for each to fail.
I think we should prioritise the other thing. Waiting a while for Tae's message is a risk for those who are caught up in the distraction, true, but it ultimately helps in ensuring that we'll catch the culprits and stop whatever they're trying to do at the negotiations.
We will be delayed on responding to the distraction, but we can still stop the "accident" while letting Cao Chun do his thing and catch the suspects.
There are many potent cultivators there," Ling Qi pointed out. "You could…"
"Not with eyes like mine, and I do not trust those Crow creatures among our delegates without my sight," Cao Chun replied. "Further, while nothing is confirmed yet, I suspect the culprit or culprits are making use of infomorphic arts of some kind."
Looking at this, I also suspect that Shu Yue may be looking for this attack too. If the suspect is spooked, we'll disrupt their plans.