FWIW, during the Cowboys-Eagles game tonight, there was a player taken off on a stretcher. Likely LOC after a hit to the head.
The only salient observation I wanted to make is that the EMTs, trainers, team doctors, and ballboys who were swarmed around him didn't use a c-collar, and did, indeed, cut the facemask clips and flip it up. In my vast experience (a few calls to pop warner fields and a number of standbys at HS games), I have adopted the same approach.
When I was playing, it took quite a bit of effort to get a helmet off. I used to have marks on my head from the padding. Nowdays, they seem to fly off all the time, but maybe that's just because at televised levels, they hit harder. I do wonder, though, if you did have to remove the helmet, whether the air could be let out of the newer models to make them easier to remove?
With the newer models, you remove the pads below the ears (they just pop off) and you can then begin removal in the usual manner. If this does not work, you can slowly let the air out of the bladder. Remember that this may allow the head to extend a little, but it may also allow room to remove the helmet. If there is no bladder, the padding is poorly fit, or the padding is too tight within the helmet, extra care must be taken. Generally speaking though, standard removal techniques used for motorcycle helmets will work, even with tight fitting helmets. Just be VERY careful about getting enough hands available to do the job safely.
I recently reviewed some of the newer stuff and found that a presentation by some MD's missed some points about helmet removal. They claim that a cordless drill always produces less movement. Their presentation also had a nearly completely unpadded helmet. Yes, a cordless screwdriver is fastest. It can induce some movement. Anvil pruners, Trainer's Angels and so on are also fast, but how well they work depends upon where and how the plastic clips are held in place. It appears that the locations of these clips have changed since I last had to work on a football helmet, so given the variety of helmets available (old and new) I'm going to change my recommendation to that of make sure that you have a cordless drill charged and ready at all times that you're attending a football event (practice or game). Just make sure you keep the helmet securely in place while you're removing the screws and clips.
Here's a video done for an inservice (what looks like the Seahawks) about differences in their helmets and removal. Pay attention to the padding systems inside. Practicing this will cost some money to replace the plastic clips if you cut the clips off. If you have a team of people that will be the ones to do the standbys, it behooves you to try to get some practice in removal procedures every season.
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This next video may or may not run to completion, but pay attention to that they need 4 people to do this right (and it still wasn't completely right). The person assisting at the neck is doing a couple things that aren't easy to visualize, but he's cutting the chin straps off and popping the ear padding off of the helmet. He should have also removed those pads. They just slide right out as shown in the previous video.
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Hockey, Field Hockey, Lacrosse, and other sports that may have players in padding and full face helmets, may not have as easy to remove equipment. Those helmets should be a bit more flexible. Remove the helmet like a full face motorcycle helmet, if necessary. Any shoulder padding should be cut so that you split the gear into an anterior piece and posterior piece. Once that happens, remove the gear like football pads. Presence of shoulder pads will, like football, require removal of both helmet and pads.
If you do not have to remove the helmet and pads, leave them on. Remember that you can often secure the player to the LSB better with the pads and helmet in place. With football, if you leave the gear in place, do not use a cervical collar. They won't fit and the gear is designed to maintain neutral spine while it is on and in place. If the player has a cowboy collar on, the collar will secure the head VERY well and limit movement.