HeadCrab Spawning Bug

So, I was playing and eventually got to the part in “Unforeseen Concequences” where you go down a lift and some HeadCrabs start spawning above you and fall on you. Well, after activating the lift, I saw there was a Health device inside the office right in front of the lift, so I jumped off it and went to the office to get my free health. Then, I dropped down to the lift and started to wait for the HeadCrabs to spawn, but they didn’t. I’m guessing they only spawn if you stay on the lift at all times, right?

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.