Confusion | Black Mesa (Part 4)

Today I tried Power Up, where there was a lot of confusion. It took me a while to figure out how to kill the gargantua but I managed to do it. Then we made it to chapter On A Rail, where I just couldn't figure out what to do (it is different in Half-Life).
Hopefully in part 5 we will figure it out and be able to continue the game.
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