I don't think anyone can say for sure what the problem is. It could very well be a strain or small tear. It sounds like you may have an imbalance (strength, structure, or flexibility, who knows which) or some technique flaw. Either way, technique work with lighter weight is definitely in order once your calf feels better. I'd give it at least 2 weeks off, maybe even a month. In my experience (this is strictly anecdotal), direct calf work doesn't tend to result in decreased injury, when people are prone to repeated injuries in the calf or lower leg, but it might be a good idea to give it a go anyway.
The blessing and curse of accelerated training is that force=massxacceleration, so increasing acceleration can increase force by a HUGE amount. That amount can definitely be greater than your body's structural ability to absorb force and break you down, in the form of damaged muscles, tendons, or worse. I just had surgery to repair a ruptured pectoralis major tendon, thanks to my "perfect rep" being a little too perfect (or not so) for my tendon to withstand. High speed eccentrics can allow you to perform a faster/more forceful concentric, due to a rebounding like effect in the tendon and some "oh shit" sensors, that are supposed to shutdown your muscle contraction, being over ridden due to the speed (sorry, I'm too lazy to pull out the books and write and reference the proper technical terminology and explanation, but it's in a bunch of those Soviet classics). All these factors can work in your favor or injure you. In my opinion, technique needs to be perfect and weights need to be low (I like the Westside way) for accelerated training to be worth the risk.
Christian Thib is much smarter than I am and may very well disagree with me. He would probably do so in a much more eloquent and convincing fashion too, so I don't blame you if you don't want to take my advice. It's your body and you are the one who has to live with the injuries or increased strength you develop from your training.
Good luck with the calf. I hope it heals up soon.