Unfortunately, there's a lot more that happened besides these two cyclists riding with someone who was involved in a fatal collision.
You get a much better picture while reading the previous court decision.The two other cyclist pleaded guilty to Careless & Dangerous Driving under the Criminal Code.
After the collision, they left their friend to die on the street. Both cyclist took off, and didn't bother staying. I wouldn't shed a tear for them being found 25% liable.
Mallory v. Werkmann et al, 2014 ONSC 971 (CanLII)
[9] On September 30, 2010 before the Honourable Justice H. I. Chisvin at Newmarket, the defendant Mr. Mihali pleaded guilty to careless driving contrary to s. 130 of the Highway Traffic Act. At the same time, Mr. Nemes pleaded guilty to dangerous driving under the Act.
[30] I find that the three cyclists were engaged in a joint venture to participate in activity that involved driving considerably in excess of the speed limit and breaking other rules of the road. They encouraged and incited one another to do so. Immediately before the collision Mr. Mihali’s action in pulling away at a high rate of speed from Mr. Werkmann implicitly incited Mr. Werkmann to drive at the speed he did in order to follow to Mr. Mihali’s home to get warm. In failing to remain at the scene of the accident, as anyone would whose friend had just been killed, the two cyclists left. I find that they did that because they were conscious of having been, in part, to blame for what had happened.