Please see my comments in my answer here - When a QB slides, is it considered a dead ball?
For your specific question of a QB sliding feet first. The ball should be spotted when he starts his slide where the ball was at that point. Not when a shin or thigh or anything else hits.
The other answer is simply incorrect. One could even go as far as ...
As of 2018 the ball is spotted from the position at which the quarterback initiates the slide. This applies on any type slide or dive, for any ball carrier. So in this case, when the quarterback slides with the ball in his hands, the ball is spotted at the yardage it was when his body first contacts the ground, which is usually his thigh, shin or knee.
The 'Danger Area', or 'The Protected Area', is defined in the MCC Laws of Cricket: Law 41 - Unfair Play:
41.11 The protected area
The protected area is defined as that area of the pitch contained within a rectangle bounded at each end by imaginary lines parallel to the popping creases and 5 ft/1.52 m in front of each, and on the sides by imaginary ...
I'm adding to the accepted answer to respond to comments in the question.
It seems very different from OT rules in all other American sports leagues
Every American sports league is designed to accommodate television viewership, so when OT rules are different from regulation rules, the trade-off is to end the game quickly without seeming overly unfair or ...
Ball in Play
Yes - The goalkeeper may score a goal with his feet from directly inside the goalkeeper’s penalty area when holding a ball in play.
Law 10 The Method of Scoring
A goal is disallowed if the goalkeeper of the attacking team throws or hits the
ball intentionally with his hand or arm from inside his own penalty area and
is the last ...
Yes, if it is a defensive player.
The rules require three things.
SECTION 4 - FIELD GOAL
ARTICLE 1. SUCCESSFUL FIELD GOAL
A field goal is scored when all of the following conditions are met:
(a) The kick must be a placekick or dropkick made by the offense from on or behind the line of scrimmage or from the spot of a fair catch (fair-catch kick). ...
No, it won't be offside.
A attacking team can go on if the ball is taking from the defenders even though they are in offside. So the deflected ball by touching the defenders of the opponents can be taken and carry on by the attackers.
No, it is not legal
What you seem to be describing is a violation known as Goaltending. Touching the ball when it is in or over the ring is a violation and the opposing team is awarded the points associated with the shot.
The relevant ruling states:
Section I—A Player Shall Not:
i. Touch the rim, net or ball while the ball is in the net, ...
No - There is no time limit specified in the laws of the game in regards to how quickly a player must leave the field when being substituted.
Law 3 The Players
3. Substitution procedure
the player being substituted:
must leave by the nearest point on the boundary line
unless the referee indicates that the player may leave directly and
No. There is no specific time requirement.
The only requirements of the player leaving the field are that they do so by the nearest point on the boundary line (unless the referee directs otherwise) and go immediately to the technical area or the dressing room.
A player (or substitute, or substituted player) may be cautioned for delaying the restart of play....
This penalty situation will vary depending on the penalty, and where the penalty is enforced.
Long and short of it: if the Penalty distance is more than half the distance from the spot the foul is enforced to the offender's goal line, it is "Half distance to the Goal".
So, for example, if there was an Offensive Holding call, and the offence is on their own ...