What a fascinating thought experiment! Let me trace this laser pulse's journey through your modified physics universe.

## Speed Evolution

As the laser pulse travels toward the black hole, it would continuously **accelerate**. Starting from a region of weak gravity where light travels slowly, it would speed up as it enters regions of progressively stronger gravitational fields. This creates a very different picture from our universe - instead of maintaining constant speed, the pulse would experience something analogous to falling into a gravitational well, but for its propagation speed rather than just its energy.

## Frequency Changes

The frequency evolution would be particularly interesting. The pulse would experience **gravitational blueshifting**, but likely more extreme than in our universe. Here's why:

- The typical gravitational blueshift would still occur due to the pulse "falling" into the gravitational potential
- Additionally, there might be a **Doppler-like effect** from the changing speed of light itself
- These effects would compound, creating an intense blue-shifting as the pulse approaches the black hole

## Trajectory Modifications

The path would curve due to a **modified form of gravitational lensing**. In this universe, the trajectory would bend through a mechanism similar to refraction:

- As the pulse travels through regions of varying gravitational field strength, it experiences varying light speeds
- This creates a **gradient in the refractive index** of space itself
- The pulse would bend toward regions of stronger gravity (higher light speed), following a path reminiscent of light bending through a gradient-index lens
- The trajectory would likely be **more strongly curved** than standard gravitational lensing predicts

## Near the Event Horizon

As the pulse approaches the black hole's event horizon, dramatic effects would emerge:

- The speed might approach some maximum value (perhaps even becoming infinite at the horizon in this hypothetical physics)
- The frequency would be shifted to extreme energies
- The notion of an "event horizon" itself might be fundamentally different - it might not be a point of no return in the traditional sense if light speed becomes arbitrarily high

This universe would have profoundly different cosmology and black hole physics than our own!