I doubt that there will be any futher military escalation.
A depth chage over the towed array would be, IMHO, a wreckless escalation to violence that has not occurred by either side to date and would result in much more serious consequences all around.
I pray that cooler heads prevail.
The PRC has shown that it is capable of using non-violent means to attempt to degrade the information that the Impeccable is gathering short of physical violence.
The US DDG is there to specifically prevent any escalation to violence against the Impeccable which is as an unarmed vessel and incapable of such escalation.
The incident wth the five smaller vessels is not the first in this regard. The more serious incident, IMHO, occurred a few days earlier when a PLAN FFG (an armed combatant) abruptly cut across the bow of the Impeccable at a range of 100 yards presenting a serious potential for collission.
As I said, at this point, hopefully cooler heads will prevail and the incident will fade as the Impeccable goes about its way and in a few days departs the area.
I hope so, also.
But, even if the situation gets defused and China retracts, for the moment, from this disput,
this was a clear message of enmity maded against China, and I believe they will take this as a basis for their future military developments, if i understood it clearly.