The refs do not protect Allen like they do other QBs. Some of it must be his reckless style but still, the horse collar tackle set a bad tone. Dumb rule, but called correctly, still he was hit in the helmet quite a bit. Once that happened Allen reverted to street ball. Face masks, laterals, etc.
Thankfully he calmed down and made big plays on the last drive. Otherwise this looks like the Houston playoff game part 2 and we are questioning his growth.