Station A detects 9.6 microseconds of idle time and begins to transmit. At the same time, it is listening for collisions. In this case, remember that for one reason or another, the network is violating the maximum cable length specification for whatever type of cabling is being used (500 meters for 10 BASE-5 thick Ethernet, 185 meters for 10 BASE-2 thin Ethernet).

Late Collisions - Figure 1