1) Make sure you have the HL console enabled. see here.
2) To go in spectate mode, type in console :
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spectate
3) Press "jump" key to change view option. Press left button mouse to change player.
4) When you are bored of the spectate mode, you can go back in game. Type in consolen the following command :
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jointeam
5) Bored to type these command, see bind section here