Reactions

Based on the OBD wiki:

Reactions are distinct
from speed in many ways. There are plenty of characters who are not
particularly in terms of speed, but have enormously swift reactions.
This is also what enables characters to trade close range blows at super
 speed. This is why a character who can run at hundreds of mph on a flat
 desert or straight road may not be able to trade blows or dodge at
those speeds. A human may not be swift enough to handle a werewolf, but
they can react fast enough to pull the trigger on their gun and kill it
with a silver bullet. Some characters have psychic attacks that they can
 use in an instant, but may be physically disabled.

One of the most
important aspects, is that on the same speed tier, someone with swifter
reactions will appear to have the advantage, being able to precisely
counter every single move. This is a tier list of character reaction
times.

For humans, reaction
time averages around 200 milliseconds, or a fifth of a second, though
people in general vary between poor reactions of 300 milliseconds, and
quick responses of 150 milliseconds, depending on the person and the
situation.

Human reactions seem
 to peak around 100 milliseconds, though brain activity tests on
sprinters have shown that some level of reaction is possible down to 85
milliseconds. The swiftest possible "reaction" in a real world human is
the innate reflex, which sends a signal only to the spinal column
instead of the brain, allowing you to command a hand to jerk away from a
 hot kettle in as little as 75 milliseconds.

Movements nearer to
the spinal nerves can occur in as little as 40 milliseconds (such as in
the neck). However, generally these types of "reactions" are not the
kinds that enable you to dodge a punch, or catch a falling object, as
they are startle and pain responses that are automatic and isolated
without a calculation of response, or coordinating enough muscle groups
for complex movements. As such, 1/10th of a second can generally be
considered the peak of human response in a practical sense, though as
previously mentioned, for most people they can react and press a button
from responding to a light around 1/5th of a second or less.

**1 millisecond:** 1000th of a second

**1 microsecond:** 1,000,000th of a second

**1 nanosecond:** 1,000,000,000th of a second

**1 picosecond:** 1,000,000,000,000th of a second

**Average human reaction time:** 200 milliseconds

**Peak human reaction time:** 100 milliseconds

**Sound Speed:** 340m/s per second at sea level and defined atmospheric pressure/temperature (actually 343, but whatever)

**Hypersonic:** 5 times the speed of sound, or approximately 1700m/s

### Tiers:

**Normal human/Peak Human perception**
 - 300 to 100 milliseconds - able to react to sound speed attacks from
102 to 34 meters (though it should be noted that real world humans would
 not be able to see small sound speed projectiles like bullets in
flight)

-Humans and most other land mammals

**Peak Human/Superhuman perception**
 - 100 to 10 milliseconds (1 to 10 times Peak Human) - able to react to
sound speed attacks from 34 to 3.4m/to Hypersonic from 170 to 17 meters

-Housefly

**Sonic/Supersonic melee**
 - 10 to 1 milliseconds (10-100xPH) - able to react to sound speed
attacks from 3.4m to 34cm (react to sound speed melee attacks)/to
Hypersonic from 17 to 1.7m

**Hypersonic melee**
 - 1 millisecond to 100 microseconds (100-1KxPH) - able to react to
Hypersonic attacks from 1.7m to 17cm (within melee range)/to Mach 100
from 340 to 34m

**Massively Hypersonic perception** - 100 to 10 microseconds (1K-10KxPH) - able to react to Mach 100 attacks from 34 to 3.4m

**Massively Hypersonic melee** - 10 to 1 microseconds (10K-100KxPH) - able to react to Mach 100 attacks from 3.4m to 34cm (within melee range)

**Nigh Relativistic perception** - 1 microsecond to 100 nanoseconds (100K-1MxPH) - able to react to Mach 1000 attacks within "melee range"

**Low Relativistic melee** - 100 to 10 nanoseconds (1M-10MxPH) - able to react to Mach 10,000 (1%c roughly) attacks within "melee range"

**Mid Relativistic melee** - 10 to 1 nanoseconds (10M-100MxPH) - able to react to Mach 100,000 (10%c roughly) attacks within "melee range"

**Lightspeed melee**
 - 1 nanosecond to 100 picoseconds (100 Million to 1 Billion times Peak
Human) - able to react to lightspeed attacks within "melee range"

**FTL melee reactions**

**Massively FTL melee reactions**

**Infinitely swift reactions**