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hello and thank you for using this site to help you. This breed is prone to seizure activity which does not always mean that a dog is going to go stiff , or start paddling its legs with rolling eyes. There are different components to seizures, some are focal where a dog actually sees something, some can lead to fly biting where the dog snaps at imaginary flies and sometimes it leads to air licking. Because you do not know a full history I would have your Vet do an exam for this.
Deafness is also prone to the Collie breed so that should be checked as well so you can keep him safe.
when it comes to seizures , you can only keep him safe from harm and wait it out. If a grand mal seizure lasts 10 minutes , if it happens two or more times in a 24 hour period or the dog goes into another one before completely coming out of the first one then go to a Vet as soon as you can. If grandmal seizures are infrequent then usually nothing is done. If the above happens then medication is given usually for life.