Driver Blames Spider Bite for Crash With Motorcyclist

The Texas man who swerved into a motorcycle and injured two people claims it was all an accident.
3:30 | 10/20/15

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Transcript for Driver Blames Spider Bite for Crash With Motorcyclist
We turn to that wild scene on a Texas highway. This driver charge for swerving into that motorcycle. He claims it was an accident. Has a very unusual excuse. ABC's Ryan Owens has the story. Reporter: Millions have watched this disturbing video online. A car swerving right into a motorcycle as it tries to pass on a Texas highway. The motorcyclist is thrown from the bike, his girlfriend riding on the back seriously injured. Just as jarring, the reaction of the driver who hit them. What were you doing? You hit them. I don't care. I got it on video too. I don't care. Reporter: That's 68-year-old William Crum being confronted by the motorcyclist's friend who recorded it all. I got it on video too. I don't care. Reporter: This morning Crum has a most unusual excuse for hitting the bike. All of a sudden I felt this tremendous stinging in my left leg and I thought it was a wasp or something and I didn't know it was a spider bite. Reporter: Causing him to jerk the wheel and swerve into the left lane. I didn't try to hurt anybody. I just -- it was a reflex from the pain. Reporter: Eric sanders is the biker who still covered in road rash and not buying Crum's story of the mystery insect. The car jerked over towards me violently. He had 100% control of that car the entire time he was driving it. Reporter: The district attorney isn't buying it either. Late Monday charging William Crum with two counts of aggravated assault with a deadly weapon. His car. Before he was charged with the two felonies, Crum was asked if he wants to apologize to the couple. To her, but to him, no, 'cause he was doing something illegal. Reporter: It's true police cited sanders for illegally passing the car but Crum may now have to use his bug bite defense in court. For "Good morning America," Ryan Owens, ABC news, grandbury, Texas. Let's talk to Dan Abrams about this. We heard the twinkie defense and now the spider defense. Yeah, come on. This is not going to be a successful defense. There are real defenses out there. For example, I had a seizure. I was attacked. Those are defenses where you say, look, it wasn't my fault that something that I did in the car ended up hurting someone. The smieder or wasp defense isn't going to work and in particular because of what he says -- That's what I was going to ask you about. He says this guy was doing something illegal. It's not just that but immediately after the incident, he's basically saying that he's not sorry about what happened. He's talking about people doing wheelies, et cetera. He's clearly got animus. If I was this guy, I would definitely try and cut a deal. You're talking about serious crimes here. He's being charged with two counts of assault with a deadly weapon. Up to 2 to 20 years behind bars is the sentence for this kind of crime. If I were him I would drop the spider defense, drop the wasp defense and instead try and get in there with the prosecutors and say to them, I want to cut a deal. Offer me some sort of lesser conviction here, because, remember, he doesn't even have to have intentionally did it. He just has to have been reckless in doing it. That makes it a really tough defense for him in this case. Free legal advice from Dan Abrams. Yeah. This guy is going to need some help. Okay, Dan, thanks very much.

This transcript has been automatically generated and may not be 100% accurate.

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