You don't have much of a basis to breach the contract. You being freaked out over something that you don't describe does not support breaking the contract. You have a contract. Unless you have evidence that would establish anticipatory repudiation or other substantive defense, you are stuck.
Since you provide no relevant facts and one would need to review your contract, speak with a local contract attorney before you make a mistake that lands you in court.
This answer is for informational purposes only and is not legal advice regarding your question and does not establish an attorney-client relationship.
Anticipatory repudiation is a contracts rule that excuses perfomance of a contract by party A because Party B clearly and positivley, by conduct or words, communicated his inability to meet the requirements of the contract.
You provide very little facts about the contract, the other persons conduct, and what exactly they "freaked out" over. Was it even related to the contract or their ability to perform the requirements of the contract?
The issue is further complicated by the fact that the "freaking out" party returned to you prior to the work being required and stating he is ready, willing and able to perform his duties. He's arguably providing you with the assurance to carry out the contract.
I would suggesst speaking to a local attorney.
This response does not create an attorney-client relationship between you and I. I am not your lawyer and I am not representing you in the underlying issue stated in your question. The response I have offered is not intended to be relied upon, you should seek out an attorney to assist in this matter.