Lets say hypothetically speaking that I have an account value of $500. I initiate ONE 100/105 bear call spread on XYZ for a net credit of say $3. XYZ 100 call= $5, XYZ 105 call= $2. If at expiration XYZ is at 105 will I be required to buy 100 shares of XYZ at $105 thus being long 100 shares of XYZ requiring $10,500 (margin call) OR just pay the difference ($500)? Will the account value support this trade? Besides unlimited risk to the upside, what if I just sold the XYZ 100 call naked with the same outcome? Will margin requirments prevent this trade? I now find myself confused with this.