How LAN Works in Video Games with Single Station Transmission

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I've read the in a LAN the data is transmitted in packets so as to allow only one station to transmit at a given time, so how could this be applied in video games LAN parties if only one device is going to transmit at a given time ?

Data are usually transmitted in packets.
Because the medium is shared, only one station at a time can transmit a packet.

Stalling, Data and Computer Communications, 5th ed.Pearson

Best Answer

Only one device is allowed to transmit at any given time. At any other given time, another device is allowed to transmit.

How can you have a conversation at a dinner table if only person can speak at any time?