Are you talking about FED rules, or NCAA rules?
In either case, we do not "blow the play dead" at the 10 yard line as you suggest. A foul NEVER causes the ball to become dead. The result of the play is a touchdown, with an Unsportsmanlike Conduct foul at the B 10.
Here's where things change depending on ruleset.
NFHS:
Touchdown stands, Team B can take the 15-yard penalty on the try or on the subsequent kickoff (see the rule I posted previously).
NCAA:
Live-ball UNS at the 10-yard line. If Team B accepts the penalty (and they will), basic spot is the 10-yard line. Next snap will be at the B 25, 1st and 10 if the 25 is beyond the line-to-gain of the previous play, otherwise replay the previous down.
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