I have worked as a psych tech for 10yrs now as well as a EMT, i worked for a behavioral ambulance company for awhile and that what we specialized in was those types of calls, really all u can do is restrain all limbs, spit mask if u have one or just a regular Tb mask works just fine. As a medic u have the option of giving them a IM considering patient wouldn't allow u to give them a IV. Sedate and restrain. That's all you really can do.