A: Oftentimes if there is any evidence indicating that the incident was a result of domestic violence, law enforcement will make an arrest warrant. This applies even if the alleged victim is reluctant or does not write a statement.
From the perspective of the prosecuting attorney, a reluctant victim/witness can make the case difficult to prove but not necessarily impossible. Reluctant victims sometimes become willing witnesses. You should seek out an experienced criminal defense attorney for help.
A: No. You could be charged as a party to the crime of assault. In other words, the allegation would be that you aided, assisted, or abetted the individual that actually committed the assault. As such, you also stand in that person's shoes and the potential penalty is the same for the individual that commits the crime (assault) and the person that aids.
If you have been charged, you should seek the assist of counsel. Good luck
A: Felony obstruction is a serious charge. Unlike the misdemeanor variety, the felony obstruction indicates that you did violence or offered to do violence to the officer.... You should definitely consult "directly" with an attorney and not try to resolve this on your own.
Officers are given discretion in making arrests. Warrants are generally not required prior to making an arrest, even where there is no prior complaint. The legal standard is probable cause. In other words, if an officer observes or has evidence to show that you may have committed a crime, he or she can make that arrest. Bear in mind that probable cause to arrest does not mean that there is enough evidence to convict.